diff --git a/.browserslistrc b/.browserslistrc
new file mode 100644
index 0000000..2c90ae7
--- /dev/null
+++ b/.browserslistrc
@@ -0,0 +1,2 @@
+> 0.25%
+not dead
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..2ab1835
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,32 @@
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+# Matches multiple files with brace expansion notation
+# Set default charset
+[*.{js,py}]
+charset = utf-8
+
+# 4 space indentation
+[*.py]
+indent_style = space
+indent_size = 4
+
+# Tab indentation (no size specified)
+[Makefile]
+indent_style = tab
+
+# Indentation override for all JS under lib directory
+[src/**.{js,ts}]
+indent_style = space
+indent_size = 2
+
+# Matches the exact files either package.json or .travis.yml
+[{package.json,.travis.yml}]
+indent_style = space
+indent_size = 2
+
diff --git a/.eslintignore b/.eslintignore
new file mode 100644
index 0000000..0e75fe5
--- /dev/null
+++ b/.eslintignore
@@ -0,0 +1,3 @@
+node_modules
+dist
+coverage
diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 0000000..77b820d
--- /dev/null
+++ b/.eslintrc.js
@@ -0,0 +1,56 @@
+module.exports = {
+  env: {
+    es6: true,
+    browser: true,
+    webextensions: true,
+  },
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+    'ecmaVersion': 9,
+    'sourceType': 'module',
+    'tsconfigRootDir': __dirname,
+    'project': './tsconfig.json',
+  },
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:@typescript-eslint/recommended-requiring-type-checking',
+    'plugin:prettier/recommended'
+  ],
+  plugins: [
+    '@typescript-eslint',
+    'simple-import-sort',
+    'svelte3',
+    'prettier'
+  ],
+  overrides: [
+    {
+      files: ['*.svelte'],
+      processor: 'svelte3/svelte3'
+    }
+  ],
+  rules: {
+    '@typescript-eslint/no-non-null-assertion': 'off',
+    'simple-import-sort/sort': [
+      'error',
+      {
+        groups: [
+          // Configuration based on https://github.com/lydell/eslint-plugin-simple-import-sort/blob/7b29c07/examples/.eslintrc.js#L71-L89
+          // Packages.
+          ["^svelte", "^@?\\w"],
+          // Internal packages.
+          ["^(@Treetop)(/.*|$)"],
+          // Side effect imports.
+          ["^\\u0000"],
+          // Parent imports. Put `..` last.
+          ["^\\.\\.(?!/?$)", "^\\.\\./?$"],
+          // Other relative imports. Put same-folder imports and `.` last.
+          ["^\\./(?=.*/)(?!/?$)", "^\\.(?!/?$)", "^\\./?$"],
+          // Style imports.
+          ["^.+\\.s?css$"],
+        ]
+      }
+    ],
+    'prettier/prettier': 'error'
+  }
+};
diff --git a/.github/workflows/node.js.yml b/.github/workflows/node.js.yml
new file mode 100644
index 0000000..4efe92f
--- /dev/null
+++ b/.github/workflows/node.js.yml
@@ -0,0 +1,21 @@
+name: CI
+
+on:
+  push:
+    branches: '**'
+  pull_request:
+    branches: '**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js
+      uses: actions/setup-node@v1
+      with:
+        node-version: '14.x'
+    - run: npm ci
+    - run: npm run lint
+    - run: npm run validate
+    - run: npm test
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..3699fe9
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,44 @@
+on:
+  push:
+    tags:
+    - 'v*'
+
+name: Release
+
+jobs:
+  build:
+    name: Upload Release Asset
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Set output filename
+        id: set-filename
+        run: echo ::set-output name=filename::treetop-${GITHUB_REF#refs/*/}.zip
+      - name: Use Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: '14.x'
+      - run: npm ci
+      - run: npm run build
+      - run: npx web-ext build --no-input=true --filename "${{ steps.set-filename.outputs.filename}}"
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: ${{ github.ref }}
+          draft: false
+          prerelease: false
+      - name: Upload Release Asset
+        id: upload-release-asset
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: ./web-ext-artifacts/${{ steps.set-filename.outputs.filename}}
+          asset_name: ${{ steps.set-filename.outputs.filename}}
+          asset_content_type: application/zip
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..10b9914
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+coverage/
+dist/
+node_modules/
+web-ext-artifacts/
+.vscode/
diff --git a/.prettierrc.toml b/.prettierrc.toml
new file mode 100644
index 0000000..4396caf
--- /dev/null
+++ b/.prettierrc.toml
@@ -0,0 +1,5 @@
+singleQuote = true
+svelteAllowShorthand = true
+svelteBracketNewLine = false
+svelteSortOrder = "scripts-styles-markup"
+svelteStrictMode = false
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..63836a4
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,13 @@
+# Treetop Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+## [Unreleased]
+
+## [0.1.0] - 2020-11
+### Added
+- Initial release.
+
+[Unreleased]: https://github.com/msmolens/treetop/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/msmolens/treetop/releases/tag/v0.1.0
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e20c5af
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2020 Max Smolens
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..7ecd8a9
--- /dev/null
+++ b/README.md
@@ -0,0 +1,79 @@
+![CI](https://github.com/msmolens/treetop/workflows/CI/badge.svg)
+
+# ![Treetop logo](src/icons/generated/icon48.png) Treetop
+
+Treetop is a Firefox extension that provides a high-level live view of your bookmarks:
+
+![Screenshot of Treetop](images/screenshots/treetop.png)
+
+## Usage
+
+### Getting started
+
+- Open Treetop by clicking its icon in the toolbar.
+
+### Always up-to-date
+
+- Treetop updates automatically as you browse.
+
+- Recently visited bookmarks have a larger font.
+
+### Edit your bookmarks
+
+- Right-click to edit or delete bookmarks and folders.
+
+### Customize
+
+- Click the Preferences button to customize Treetop's display.
+
+- Click a folder to set Treetop's root.
+
+## Development
+
+### Requirements
+
+- [Node.js](https://nodejs.org/) 12.x or greater
+- Firefox browser
+
+### Prerequisites
+
+Install dependencies:
+
+```
+npm install --global web-ext
+npm install
+```
+
+### Commands
+
+| Command             | Description |
+| ------------------- | ----------- |
+| `npm run build:dev` | Build for development. |
+| `npm run build`     | Build for release. |
+| `npm run lint`      | Check code for linting errors. |
+| `npm run lint:fix`  | Fix linting errors. |
+| `npm run validate`  | Check for unused CSS, a11y issues, and TypeScript errors with [svelte-check](https://github.com/sveltejs/language-tools/tree/master/packages/svelte-check). |
+| `npm test`          | Run tests. |
+| `web-ext run`       | Start Firefox and load the extension temporarily. |
+| `web-ext build`     | Package the extension. |
+
+### Core Technologies
+
+#### Development
+- [Svelte](https://svelte.dev/): Component framework.
+- [Typescript](https://www.typescriptlang.org/): Typed JavaScript.
+- [Rollup](https://rollupjs.org/): Module bundler.
+- [Svelte Material UI](https://sveltematerialui.com/): Material UI components for Svelte.
+- [ESLint](https://eslint.org/): Static analyzer.
+- [Prettier](https://prettier.io/): Code formatter.
+- [web-ext](https://github.com/mozilla/web-ext): Command line tool for web extensions.
+
+#### Testing
+- [Jest](https://jestjs.io/): Testing framework.
+- [Svelte Testing Library](https://testing-library.com/): Framework to test Svelte components.
+- [mockzilla-webextension](https://lusito.github.io/mockzilla-webextension/): Mocking toolkit for web extensions.
+
+## History
+
+Treetop is a modern remake of my [My Portal](https://github.com/msmolens/myportal)
+XUL/XPCOM Firefox extension.
diff --git a/_locales/en/messages.json b/_locales/en/messages.json
new file mode 100644
index 0000000..af5eac9
--- /dev/null
+++ b/_locales/en/messages.json
@@ -0,0 +1,115 @@
+{
+  "extensionDescription": {
+    "message": "A high-level live view of your bookmarks.",
+    "description": "Description of the extension."
+  },
+  "bookmarks": {
+    "message": "Bookmarks",
+    "description": "Standard name for bookmarks."
+  },
+  "preferences": {
+    "message": "Preferences",
+    "description": "Label on button to open preferences."
+  },
+  "menuItemOpenAllInTabs": {
+    "message": "&Open All in Tabs",
+    "description": "Title of context menu item that opens all of a folder's bookmarks in new tabs."
+  },
+  "menuItemDelete": {
+    "message": "&Delete",
+    "description": "Title of context menu item that deletes a bookmark."
+  },
+  "menuItemProperties": {
+    "message": "Propert&ies",
+    "description": "Title of context menu item to edit bookmark properties."
+  },
+  "dialogButtonCancel": {
+    "message": "Cancel",
+    "description": "Label on button to cancel a dialog."
+  },
+  "dialogButtonDelete": {
+    "message": "Delete",
+    "description": "Label on button to perform a delete action."
+  },
+  "dialogButtonSave": {
+    "message": "Save",
+    "description": "Label on button to perform a save action."
+  },
+  "dialogHeadingDeleteFolder": {
+    "message": "Delete Folder",
+    "description": "Title of dialog to confirm deleting a folder."
+  },
+  "dialogHeadingBookmarkProperties": {
+    "message": "Properties for \"$TITLE$\"",
+    "description": "Title of dialog to edit bookmark properties.",
+    "placeholders": {
+      "title": {
+        "content": "$1"
+      }
+    }
+  },
+  "dialogMessageDeleteFolder": {
+    "message": "Are you sure you want to delete this folder and all its bookmarks?",
+    "description": "Message on dialog to confirm deleting a folder."
+  },
+  "optionHeadingGeneral": {
+    "message": "General",
+    "description": "Title of group for general options."
+  },
+  "optionHeadingBookmarks": {
+    "message": "Bookmarks",
+    "description": "Title of group for bookmark options."
+  },
+  "optionShowBookmarksToolbar": {
+    "message": "Show Bookmarks Toolbar",
+    "description": "Title of option to show the Bookmarks Toolbar folder."
+  },
+  "optionShowBookmarksMenu": {
+    "message": "Show Bookmarks Menu",
+    "description": "Title of option to show the Bookmarks Menu folder."
+  },
+  "optionShowOtherBookmarks": {
+    "message": "Show Other Bookmarks",
+    "description": "Title of option to show the Other Bookmarks folder."
+  },
+  "optionTruncateLongTitles": {
+    "message": "Truncate long titles",
+    "description": "Title of option to truncate long bookmark titles."
+  },
+  "optionDisplayTooltips": {
+    "message": "Show tooltips",
+    "description": "Title of option to display bookmark tooltips."
+  },
+  "optionShowRecentlyVisited": {
+    "message": "Increase font size if recently visited",
+    "description": "Title of option to increase the font size of recently visited bookmarks."
+  },
+  "folderNoTitle": {
+    "message": "(no title)",
+    "description": "Display text for folder that has no name."
+  },
+  "emptyFolder": {
+    "message": "Empty folder",
+    "description": "Display text for the contents of an empty folder."
+  },
+  "errorRetrievingBookmark": {
+    "message": "Error retrieving bookmark.",
+    "description": "Message shown when an error occurs when showing the properties dialog."
+  },
+  "errorSavingBookmark": {
+    "message": "Error saving bookmark.",
+    "description": "Message shown when an error occurs when saving a bookmark's properties."
+  },
+  "errorLoadingPreferences": {
+    "message": "Error loading preferences.",
+    "description": "Message shown when an error occurs when loading the extension's preferences."
+  },
+  "errorLoadingBookmarks": {
+    "message": "Error loading bookmarks.",
+    "description": "Message shown when an error occurs when loading bookmarks."
+  },
+  "errorLoadingHistory": {
+    "message": "Error loading history.",
+    "description": "Message shown when an error occurs when loading history."
+  }
+}
diff --git a/babel.config.js b/babel.config.js
new file mode 100644
index 0000000..23e00ba
--- /dev/null
+++ b/babel.config.js
@@ -0,0 +1,5 @@
+module.exports = {
+  "presets": [
+    ['@babel/preset-env', { targets: { node: 'current' } }],
+  ]
+}
diff --git a/fonts/Inter/Inter-Light.woff2 b/fonts/Inter/Inter-Light.woff2
new file mode 100644
index 0000000..80378a3
Binary files /dev/null and b/fonts/Inter/Inter-Light.woff2 differ
diff --git a/fonts/Inter/Inter-Medium.woff2 b/fonts/Inter/Inter-Medium.woff2
new file mode 100644
index 0000000..3b31d33
Binary files /dev/null and b/fonts/Inter/Inter-Medium.woff2 differ
diff --git a/fonts/Inter/Inter-Regular.woff2 b/fonts/Inter/Inter-Regular.woff2
new file mode 100644
index 0000000..d5ffd2a
Binary files /dev/null and b/fonts/Inter/Inter-Regular.woff2 differ
diff --git a/fonts/Inter/Inter.css b/fonts/Inter/Inter.css
new file mode 100644
index 0000000..f2d795a
--- /dev/null
+++ b/fonts/Inter/Inter.css
@@ -0,0 +1,23 @@
+@font-face {
+  font-family: 'Inter';
+  font-style:  normal;
+  font-weight: 300;
+  font-display: swap;
+  src: url("Inter-Light.woff2?v=3.13") format("woff2");
+}
+
+@font-face {
+  font-family: 'Inter';
+  font-style:  normal;
+  font-weight: 400;
+  font-display: swap;
+  src: url("Inter-Regular.woff2?v=3.13") format("woff2");
+}
+
+@font-face {
+  font-family: 'Inter';
+  font-style:  normal;
+  font-weight: 500;
+  font-display: swap;
+  src: url("Inter-Medium.woff2?v=3.13") format("woff2");
+}
diff --git a/fonts/Inter/LICENSE.txt b/fonts/Inter/LICENSE.txt
new file mode 100644
index 0000000..d688280
--- /dev/null
+++ b/fonts/Inter/LICENSE.txt
@@ -0,0 +1,93 @@
+Copyright (c) 2016-2020 The Inter Project Authors
+https://github.com/rsms/inter
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded,
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION AND CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.
diff --git a/fonts/MaterialIcons/LICENSE b/fonts/MaterialIcons/LICENSE
new file mode 100644
index 0000000..7a4a3ea
--- /dev/null
+++ b/fonts/MaterialIcons/LICENSE
@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
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+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
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+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
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+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
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+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
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+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
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+
+      (c) You must retain, in the Source form of any Derivative Works
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+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
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+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
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+
+      You may add Your own copyright statement to Your modifications and
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+      for use, reproduction, or distribution of Your modifications, or
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+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
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+   9. Accepting Warranty or Additional Liability. While redistributing
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+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
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+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
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+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
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\ No newline at end of file
diff --git a/fonts/MaterialIcons/MaterialIcons-Regular.woff2 b/fonts/MaterialIcons/MaterialIcons-Regular.woff2
new file mode 100644
index 0000000..9fa2112
Binary files /dev/null and b/fonts/MaterialIcons/MaterialIcons-Regular.woff2 differ
diff --git a/fonts/MaterialIcons/MaterialIcons.css b/fonts/MaterialIcons/MaterialIcons.css
new file mode 100644
index 0000000..8086315
--- /dev/null
+++ b/fonts/MaterialIcons/MaterialIcons.css
@@ -0,0 +1,34 @@
+/* http://google.github.io/material-design-icons/#icon-font-for-the-web */
+
+@font-face {
+  font-family: 'Material Icons';
+  font-style: normal;
+  font-weight: 400;
+  font-display: swap;
+  src: url("MaterialIcons-Regular.woff2") format("woff2");
+}
+  
+.material-icons {
+  font-family: 'Material Icons';
+  font-weight: normal;
+  font-style: normal;
+  font-size: 24px;  /* Preferred icon size */
+  display: inline-block;
+  line-height: 1;
+  text-transform: none;
+  letter-spacing: normal;
+  word-wrap: normal;
+  white-space: nowrap;
+  direction: ltr;
+
+  /* Support for all WebKit browsers. */
+  -webkit-font-smoothing: antialiased;
+  /* Support for Safari and Chrome. */
+  text-rendering: optimizeLegibility;
+
+  /* Support for Firefox. */
+  -moz-osx-font-smoothing: grayscale;
+
+  /* Support for IE. */
+  font-feature-settings: 'liga';
+}
diff --git a/fonts/News-Cycle/LICENSE b/fonts/News-Cycle/LICENSE
new file mode 100644
index 0000000..05a0bda
--- /dev/null
+++ b/fonts/News-Cycle/LICENSE
@@ -0,0 +1,2 @@
+SIL Open Font License (OFL) 
+https://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=OFL
diff --git a/fonts/News-Cycle/News-Cycle.css b/fonts/News-Cycle/News-Cycle.css
new file mode 100644
index 0000000..c5dc972
--- /dev/null
+++ b/fonts/News-Cycle/News-Cycle.css
@@ -0,0 +1,9 @@
+/* latin */
+@font-face {
+  font-family: 'News Cycle';
+  font-style: normal;
+  font-weight: 400;
+  font-display: swap;
+  src: url('News-Cycle.woff2') format('woff2');
+  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
+}
diff --git a/fonts/News-Cycle/News-Cycle.woff2 b/fonts/News-Cycle/News-Cycle.woff2
new file mode 100644
index 0000000..f819d40
Binary files /dev/null and b/fonts/News-Cycle/News-Cycle.woff2 differ
diff --git a/images/screenshots/context_menu.png b/images/screenshots/context_menu.png
new file mode 100644
index 0000000..ddaaf29
Binary files /dev/null and b/images/screenshots/context_menu.png differ
diff --git a/images/screenshots/preferences.png b/images/screenshots/preferences.png
new file mode 100644
index 0000000..bd963d9
Binary files /dev/null and b/images/screenshots/preferences.png differ
diff --git a/images/screenshots/properties.png b/images/screenshots/properties.png
new file mode 100644
index 0000000..8781cdc
Binary files /dev/null and b/images/screenshots/properties.png differ
diff --git a/images/screenshots/treetop.png b/images/screenshots/treetop.png
new file mode 100644
index 0000000..b9226de
Binary files /dev/null and b/images/screenshots/treetop.png differ
diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 0000000..67843c0
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,40 @@
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'jsdom',
+  roots: ['<rootDir>'],
+  transform: {
+    '^.+\\.svelte$': [
+      'svelte-jester',
+      {
+        'preprocess': true,
+      }
+    ],
+    '^.+\\.ts$': 'ts-jest',
+    "^.+\\.(js|jsx)$": 'babel-jest'
+  },
+  // Allow transpiling SMUI modules.
+  // https://jestjs.io/docs/en/configuration#transformignorepatterns-arraystring
+  transformIgnorePatterns: [
+    "node_modules/(?!(@smui)/)"
+  ],
+  moduleFileExtensions: [
+    'js',
+    'ts',
+    'svelte',
+  ],
+  moduleNameMapper: {
+    '^@Treetop/(.*)$': '<rootDir>/src/$1',
+    // Fix syntax error when testing components that use SMUI.
+    // https://github.com/facebook/jest/issues/6229
+    // https://stackoverflow.com/questions/60622265/unable-to-use-jest-to-test-svelte-components-which-import-scss-from-inside-node
+    '^.+\\.(css|less|scss)$': 'babel-jest',
+    '^.+\\.svg$': 'babel-jest',
+  },
+  setupFilesAfterEnv: ['@testing-library/jest-dom/extend-expect', './src/setupTests.ts'],
+  collectCoverage: true,
+  collectCoverageFrom: [
+    'src/**/*.{ts,tsx,js,jsx,svelte}',
+    '!src/types/**',
+    '!**/node_modules/**',
+  ],
+};
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..6e9ed36
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,12544 @@
+{
+  "name": "treetop",
+  "version": "0.0.1",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
+      "integrity": "sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.8.3"
+      }
+    },
+    "@babel/compat-data": {
+      "version": "7.12.1",
+      "resolved": "https://registry.npmjs.org/@babel/compat-data/-/compat-data-7.12.1.tgz",
+      "integrity": "sha512-725AQupWJZ8ba0jbKceeFblZTY90McUBWMwHhkFQ9q1zKPJ95GUktljFcgcsIVwRnTnRKlcYzfiNImg5G9m6ZQ==",
+      "dev": true
+    },
+    "@babel/core": {
+      "version": "7.12.3",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.12.3.tgz",
+      "integrity": "sha512-0qXcZYKZp3/6N2jKYVxZv0aNCsxTSVCiK72DTiTYZAu7sjg73W0/aynWjMbiGd87EQL4WyA8reiJVh92AVla9g==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.10.4",
+        "@babel/generator": "^7.12.1",
+        "@babel/helper-module-transforms": "^7.12.1",
+        "@babel/helpers": "^7.12.1",
+        "@babel/parser": "^7.12.3",
+        "@babel/template": "^7.10.4",
+        "@babel/traverse": "^7.12.1",
+        "@babel/types": "^7.12.1",
+        "convert-source-map": "^1.7.0",
+        "debug": "^4.1.0",
+        "gensync": "^1.0.0-beta.1",
+        "json5": "^2.1.2",
+        "lodash": "^4.17.19",
+        "resolve": "^1.3.2",
+        "semver": "^5.4.1",
+        "source-map": "^0.5.0"
+      },
+      "dependencies": {
+        "@babel/code-frame": {
+          "version": "7.10.4",
+          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.4.tgz",
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+          "dev": true,
+          "requires": {
+            "@babel/highlight": "^7.10.4"
+          }
+        },
+        "@babel/highlight": {
+          "version": "7.10.4",
+          "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
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+          "dev": true,
+          "requires": {
+            "@babel/helper-validator-identifier": "^7.10.4",
+            "chalk": "^2.0.0",
+            "js-tokens": "^4.0.0"
+          }
+        },
+        "source-map": {
+          "version": "0.5.7",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+          "dev": true
+        }
+      }
+    },
+    "@babel/generator": {
+      "version": "7.12.1",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.12.1.tgz",
+      "integrity": "sha512-DB+6rafIdc9o72Yc3/Ph5h+6hUjeOp66pF0naQBgUFFuPqzQwIlPTm3xZR7YNvduIMtkDIj2t21LSQwnbCrXvg==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.12.1",
+        "jsesc": "^2.5.1",
+        "source-map": "^0.5.0"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.5.7",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+          "dev": true
+        }
+      }
+    },
+    "@babel/helper-annotate-as-pure": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-annotate-as-pure/-/helper-annotate-as-pure-7.10.4.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.10.4"
+      }
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+    "@babel/helper-builder-binary-assignment-operator-visitor": {
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+      "resolved": "https://registry.npmjs.org/@babel/helper-builder-binary-assignment-operator-visitor/-/helper-builder-binary-assignment-operator-visitor-7.10.4.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/helper-explode-assignable-expression": "^7.10.4",
+        "@babel/types": "^7.10.4"
+      }
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+    "@babel/helper-compilation-targets": {
+      "version": "7.12.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-compilation-targets/-/helper-compilation-targets-7.12.1.tgz",
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+        "@babel/helper-validator-option": "^7.12.1",
+        "browserslist": "^4.12.0",
+        "semver": "^5.5.0"
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+    "@babel/helper-create-class-features-plugin": {
+      "version": "7.12.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-create-class-features-plugin/-/helper-create-class-features-plugin-7.12.1.tgz",
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+      "requires": {
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+        "@babel/helper-member-expression-to-functions": "^7.12.1",
+        "@babel/helper-optimise-call-expression": "^7.10.4",
+        "@babel/helper-replace-supers": "^7.12.1",
+        "@babel/helper-split-export-declaration": "^7.10.4"
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+    "@babel/helper-create-regexp-features-plugin": {
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+        "@babel/helper-regex": "^7.10.4",
+        "regexpu-core": "^4.7.1"
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+      "dev": true,
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+      "requires": {
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+      "dev": true
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+      "dev": true,
+      "requires": {
+        "cliui": "^6.0.0",
+        "decamelize": "^1.2.0",
+        "find-up": "^4.1.0",
+        "get-caller-file": "^2.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^4.2.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^18.1.2"
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+          "requires": {
+            "emoji-regex": "^8.0.0",
+            "is-fullwidth-code-point": "^3.0.0",
+            "strip-ansi": "^6.0.0"
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+      }
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+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..c9f6053
--- /dev/null
+++ b/package.json
@@ -0,0 +1,73 @@
+{
+  "name": "treetop",
+  "version": "0.0.1",
+  "description": "Treetop",
+  "scripts": {
+    "lint": "eslint ./src ./test --ext .js,.ts",
+    "lint:fix": "eslint ./src ./test --ext .js,.ts --fix",
+    "prettier": "prettier --write ./src ./test",
+    "build": "rollup --config",
+    "build:dev": "rollup --config -w",
+    "test": "jest",
+    "validate": "svelte-check"
+  },
+  "author": "Max Smolens <msmolens@gmail.com>",
+  "license": "MIT",
+  "devDependencies": {
+    "@babel/core": "^7.12.3",
+    "@babel/preset-env": "^7.12.1",
+    "@rollup/plugin-commonjs": "^16.0.0",
+    "@rollup/plugin-html": "^0.2.0",
+    "@rollup/plugin-image": "^2.0.5",
+    "@rollup/plugin-node-resolve": "^10.0.0",
+    "@rollup/plugin-typescript": "^6.1.0",
+    "@smui/button": "^1.0.0",
+    "@smui/dialog": "^1.0.0",
+    "@smui/icon-button": "^1.0.0",
+    "@smui/linear-progress": "^1.0.0",
+    "@smui/snackbar": "^1.0.0",
+    "@smui/textfield": "^1.0.0",
+    "@testing-library/jest-dom": "^5.11.5",
+    "@testing-library/svelte": "^3.0.0",
+    "@testing-library/user-event": "^12.2.0",
+    "@tsconfig/svelte": "^1.0.10",
+    "@types/faker": "^5.1.4",
+    "@types/firefox-webext-browser": "^82.0.0",
+    "@types/jest": "^26.0.15",
+    "@types/lodash": "^4.14.165",
+    "@typescript-eslint/eslint-plugin": "^4.7.0",
+    "@typescript-eslint/parser": "^4.7.0",
+    "babel-jest": "^26.6.3",
+    "eslint": "^7.13.0",
+    "eslint-config-prettier": "^6.15.0",
+    "eslint-plugin-prettier": "^3.1.4",
+    "eslint-plugin-simple-import-sort": "^5.0.3",
+    "eslint-plugin-svelte3": "^2.7.3",
+    "faker": "^5.1.0",
+    "jest": "^26.6.3",
+    "mockzilla": "^0.8.0",
+    "mockzilla-webextension": "^0.7.0",
+    "normalize.css": "^8.0.1",
+    "prettier": "^2.1.2",
+    "prettier-plugin-svelte": "^1.4.1",
+    "rollup": "^2.33.1",
+    "rollup-plugin-copy": "^3.3.0",
+    "rollup-plugin-postcss": "^3.1.8",
+    "rollup-plugin-svelte": "^6.1.1",
+    "rollup-plugin-terser": "^7.0.2",
+    "sass": "^1.29.0",
+    "svelte": "^3.29.7",
+    "svelte-check": "^1.1.11",
+    "svelte-jester": "^1.1.5",
+    "svelte-preprocess": "^4.5.2",
+    "ts-jest": "^26.4.4",
+    "typescript": "^4.0.5",
+    "webextension-polyfill-ts": "^0.21.0"
+  },
+  "dependencies": {
+    "lodash": "^4.17.20"
+  },
+  "webExt": {
+    "sourceDir": "./dist"
+  }
+}
diff --git a/rollup.config.js b/rollup.config.js
new file mode 100644
index 0000000..839cc72
--- /dev/null
+++ b/rollup.config.js
@@ -0,0 +1,144 @@
+import commonjs from '@rollup/plugin-commonjs';
+import copy from 'rollup-plugin-copy'
+import html from '@rollup/plugin-html';
+import image from '@rollup/plugin-image';
+import postcss from 'rollup-plugin-postcss'
+import resolve from '@rollup/plugin-node-resolve';
+import svelte from 'rollup-plugin-svelte';
+import typescript from '@rollup/plugin-typescript';
+import { terser } from 'rollup-plugin-terser';
+import autoProcess from 'svelte-preprocess';
+
+const production = !process.env.ROLLUP_WATCH;
+
+export default [{
+  input: 'src/treetop/main.ts',
+  output: {
+    file: 'dist/treetop.bundle.js',
+    format: 'iife',
+    name: 'treetop',
+    sourcemap: !production
+  },
+  plugins: [
+    svelte({
+      dev: !production,
+      css: false,
+      emitCss: true,
+      preprocess: autoProcess()
+    }),
+    typescript({ sourceMap: !production }),
+    resolve({
+      browser: true,
+      dedupe: ['svelte']
+    }),
+    commonjs(),
+    production && terser(),
+    postcss({
+      extract: true,
+      sourceMap: false,
+      use: [
+        ['sass', {
+          includePaths: [
+            './src/theme',
+            './node_modules'
+          ]
+        }]
+      ]
+    }),
+    image(),
+    html({
+      fileName: 'treetop.html',
+      title: 'Treetop'
+    }),
+  ],
+  external: ['firefox-webext-browser']
+}, {
+  input: 'src/options/main.ts',
+  output: {
+    file: 'dist/options.bundle.js',
+    format: 'iife',
+    name: 'options',
+    sourcemap: !production
+  },
+  plugins: [
+    svelte({
+      dev: !production,
+      css: false,
+      emitCss: true,
+      preprocess: autoProcess()
+    }),
+    typescript({ sourceMap: !production }),
+    resolve({
+      browser: true,
+      dedupe: ['svelte']
+    }),
+    commonjs(),
+    production && terser(),
+    postcss({
+      extract: true,
+      sourceMap: false
+    }),
+    html({
+      fileName: 'options.html',
+      title: 'Treetop Options'
+    })
+  ]
+}, {
+  input: 'src/welcome/main.ts',
+  output: {
+    file: 'dist/welcome.bundle.js',
+    format: 'iife',
+    name: 'welcome',
+    sourcemap: !production
+  },
+  plugins: [
+    svelte({
+      dev: !production,
+      css: false,
+      emitCss: true,
+      preprocess: autoProcess()
+    }),
+    typescript({ sourceMap: !production }),
+    resolve({
+      browser: true,
+      dedupe: ['svelte']
+    }),
+    commonjs(),
+    production && terser(),
+    postcss({
+      extract: true,
+      sourceMap: false
+    }),
+    image(),
+    html({
+      fileName: 'welcome.html',
+      title: 'Treetop'
+    })
+  ]
+}, {
+  input: 'src/background_script/main.ts',
+  output: {
+    file: 'dist/background_script.bundle.js',
+    format: 'iife',
+    name: 'background_script',
+    sourcemap: !production
+  },
+  plugins: [
+    typescript({ sourceMap: !production }),
+    resolve({
+      browser: true,
+    }),
+    commonjs(),
+    production && terser(),
+    copy({
+      targets: [
+        { src: '_locales', dest: 'dist/' },
+        { src: 'fonts', dest: 'dist/' },
+        { src: 'src/manifest.json', dest: 'dist/' },
+        { src: 'src/icons/generated/*', dest: 'dist/icons' },
+      ],
+      verbose: true
+    })
+  ],
+  external: ['firefox-webext-browser']
+}];
diff --git a/src/background_script/init.ts b/src/background_script/init.ts
new file mode 100644
index 0000000..78b6527
--- /dev/null
+++ b/src/background_script/init.ts
@@ -0,0 +1,22 @@
+import { browser } from 'webextension-polyfill-ts';
+
+import { createContextMenus } from './menus';
+import { openTreetop, openWelcome } from './open';
+import { setDefaultOptions } from './options';
+
+/**
+ * Initialize Treetop.
+ */
+export const init = async (): Promise<void> => {
+  // TODO
+  browser.runtime.onInstalled.addListener(openWelcome);
+
+  // Install handler to open Treetop when the browser action is clicked
+  browser.browserAction.onClicked.addListener(openTreetop);
+
+  // Set default options
+  await setDefaultOptions();
+
+  // Create context menus
+  createContextMenus();
+};
diff --git a/src/background_script/main.ts b/src/background_script/main.ts
new file mode 100644
index 0000000..f295466
--- /dev/null
+++ b/src/background_script/main.ts
@@ -0,0 +1,3 @@
+import { init } from './init';
+
+void init();
diff --git a/src/background_script/menus.ts b/src/background_script/menus.ts
new file mode 100644
index 0000000..346c024
--- /dev/null
+++ b/src/background_script/menus.ts
@@ -0,0 +1,48 @@
+import { browser } from 'webextension-polyfill-ts';
+
+/**
+ * Create context menus.
+ */
+export const createContextMenus = (): void => {
+  // Get match pattern for the extension's origin
+  // https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/permissions#Host_permissions
+  const origin = browser.runtime.getURL('');
+
+  const commonMenuParams: {
+    contexts: browser.menus.ContextType[];
+    documentUrlPatterns: string[];
+  } = {
+    contexts: ['link'],
+    documentUrlPatterns: [`${origin}*`],
+  };
+
+  browser.menus.create({
+    id: 'openAllInTabs',
+    title: browser.i18n.getMessage('menuItemOpenAllInTabs'),
+    ...commonMenuParams,
+  });
+
+  browser.menus.create({
+    id: 'separator1',
+    type: 'separator',
+    ...commonMenuParams,
+  });
+
+  browser.menus.create({
+    id: 'delete',
+    title: browser.i18n.getMessage('menuItemDelete'),
+    ...commonMenuParams,
+  });
+
+  browser.menus.create({
+    id: 'separator2',
+    type: 'separator',
+    ...commonMenuParams,
+  });
+
+  browser.menus.create({
+    id: 'properties',
+    title: browser.i18n.getMessage('menuItemProperties'),
+    ...commonMenuParams,
+  });
+};
diff --git a/src/background_script/open.ts b/src/background_script/open.ts
new file mode 100644
index 0000000..854cfd2
--- /dev/null
+++ b/src/background_script/open.ts
@@ -0,0 +1,61 @@
+import { browser } from 'webextension-polyfill-ts';
+
+/**
+ * Open the welcome page when the extension is installed.
+ */
+export const openWelcome = ({
+  reason,
+  temporary,
+}: browser.runtime._OnInstalledDetails): void => {
+  if (temporary || reason !== 'install') {
+    return;
+  }
+
+  const url = browser.runtime.getURL('welcome.html');
+  void browser.tabs.create({ url });
+};
+
+/**
+ * Open Treetop.
+ *
+ * Keyboard modifiers:
+ *   Left click:
+ *     None: Open in current tab
+ *     Ctrl: Open new tab in background
+ *     Ctrl+Shift: Open new tab
+ *     Shift: Open new window
+ *   Middle click:
+ *     None: Open in new tab in background
+ *     Shift: Open in new tab
+ */
+export const openTreetop = (
+  _tab: browser.tabs.Tab,
+  info: browser.browserAction.OnClickData | undefined
+): void => {
+  if (!info) {
+    return;
+  }
+
+  const url = browser.runtime.getURL('treetop.html');
+  const params: browser.tabs._CreateCreateProperties = { url };
+
+  const ctrl =
+    info.modifiers.includes('Ctrl') || info.modifiers.includes('Command');
+  const shift = info.modifiers.includes('Shift');
+
+  if (info.button === 0) {
+    // Left click
+    if (ctrl) {
+      params.active = shift;
+      void browser.tabs.create(params);
+    } else if (shift) {
+      void browser.windows.create(params);
+    } else {
+      void browser.tabs.update(params);
+    }
+  } else if (info.button === 1) {
+    // Middle click
+    params.active = shift;
+    void browser.tabs.create(params);
+  }
+};
diff --git a/src/background_script/options.ts b/src/background_script/options.ts
new file mode 100644
index 0000000..57873a5
--- /dev/null
+++ b/src/background_script/options.ts
@@ -0,0 +1,21 @@
+import { browser } from 'webextension-polyfill-ts';
+
+/**
+ * Set default options.
+ */
+export const setDefaultOptions = async (): Promise<void> => {
+  const defaultOptions = {
+    showBookmarksToolbar: true,
+    showBookmarksMenu: true,
+    showOtherBookmarks: true,
+    truncate: true,
+    tooltips: true,
+    showRecentlyVisited: true,
+  };
+
+  try {
+    await browser.storage.local.set(defaultOptions);
+  } catch (err) {
+    console.error('Error setting default options:', err);
+  }
+};
diff --git a/src/icons/generate-icons.sh b/src/icons/generate-icons.sh
new file mode 100755
index 0000000..8bc89d1
--- /dev/null
+++ b/src/icons/generate-icons.sh
@@ -0,0 +1,26 @@
+#!/usr/bin/env fish
+
+# Generate PNG icons in various resolutions from SVG file.
+# Requires Inkscape: https://inkscape.org/
+
+set PX 32 48 64 96 128 256
+
+for px in $PX
+  inkscape \
+    --export-filename="generated/icon$px.png" \
+    --export-type="png" \
+    --export-area-page \
+    --export-width=$px  \
+    --export-height=$px \
+    treetop.svg
+end
+
+# Generate optimized SVG icon.
+# Requires scour: https://github.com/scour-project/scour
+
+scour \
+  --strip-xml-prolog \
+  --remove-metadata \
+  --enable-id-stripping \
+  -i treetop.svg \
+  -o generated/icon.svg
diff --git a/src/icons/generated/icon.svg b/src/icons/generated/icon.svg
new file mode 100644
index 0000000..70a0f61
--- /dev/null
+++ b/src/icons/generated/icon.svg
@@ -0,0 +1,8 @@
+<svg width="33mm" height="33mm" version="1.1" viewBox="0 0 33 33" xmlns="http://www.w3.org/2000/svg">
+ <g transform="translate(-94.161 -137.34)">
+  <g fill="#ff4088">
+   <path d="m97.313 141.78-0.56966-3.8168 21.658 1.6171-0.16951 2.1997-9.4314-0.0666 0.50168 26.28-4.5599 1.7207 1.5007-27.934z" style="font-variant-caps:normal;font-variant-east-asian:normal;font-variant-ligatures:normal;font-variant-numeric:normal"/>
+   <path d="m113.64 169.4 0.72763-24.746 2.1922 0.0209v5.8704c0.64768-1.4332 1.68-2.4393 2.0245-2.9768 1.3505-2.0946 3.1006-3.1419 5.2503-3.1419 0.16536 0 0.41341 0.0138 0.74414 0.0413v2.3151c-0.93708 0.12403-1.7157 0.30317-2.3358 0.53744-0.62011 0.22049-1.2264 0.57878-1.819 1.0749-1.0335 0.85438-2.6791 2.5771-3.8642 5.1265l0.53626 14.575z" style="font-variant-caps:normal;font-variant-east-asian:normal;font-variant-ligatures:normal;font-variant-numeric:normal"/>
+  </g>
+ </g>
+</svg>
diff --git a/src/icons/generated/icon128.png b/src/icons/generated/icon128.png
new file mode 100644
index 0000000..974de19
Binary files /dev/null and b/src/icons/generated/icon128.png differ
diff --git a/src/icons/generated/icon256.png b/src/icons/generated/icon256.png
new file mode 100644
index 0000000..ef8b707
Binary files /dev/null and b/src/icons/generated/icon256.png differ
diff --git a/src/icons/generated/icon32.png b/src/icons/generated/icon32.png
new file mode 100644
index 0000000..c38cf13
Binary files /dev/null and b/src/icons/generated/icon32.png differ
diff --git a/src/icons/generated/icon48.png b/src/icons/generated/icon48.png
new file mode 100644
index 0000000..a602299
Binary files /dev/null and b/src/icons/generated/icon48.png differ
diff --git a/src/icons/generated/icon64.png b/src/icons/generated/icon64.png
new file mode 100644
index 0000000..d596763
Binary files /dev/null and b/src/icons/generated/icon64.png differ
diff --git a/src/icons/generated/icon96.png b/src/icons/generated/icon96.png
new file mode 100644
index 0000000..52cec42
Binary files /dev/null and b/src/icons/generated/icon96.png differ
diff --git a/src/icons/treetop.svg b/src/icons/treetop.svg
new file mode 100644
index 0000000..fb6f1c2
--- /dev/null
+++ b/src/icons/treetop.svg
@@ -0,0 +1,75 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   sodipodi:docname="tr9.svg"
+   inkscape:version="1.0.1 (0767f8302a, 2020-10-17)"
+   id="svg2979"
+   version="1.1"
+   viewBox="0 0 33.000001 33"
+   height="33mm"
+   width="33mm"
+   inkscape:export-xdpi="36.945454"
+   inkscape:export-ydpi="36.945454">
+  <defs
+     id="defs2973" />
+  <sodipodi:namedview
+     inkscape:window-maximized="1"
+     inkscape:window-y="25"
+     inkscape:window-x="0"
+     inkscape:window-height="1379"
+     inkscape:window-width="2560"
+     showgrid="false"
+     inkscape:document-rotation="0"
+     inkscape:current-layer="layer1"
+     inkscape:document-units="mm"
+     inkscape:cy="51.46473"
+     inkscape:cx="7.1544273"
+     inkscape:zoom="2.8"
+     inkscape:pageshadow="2"
+     inkscape:pageopacity="0.0"
+     borderopacity="1.0"
+     bordercolor="#666666"
+     pagecolor="#ffffff"
+     id="base"
+     fit-margin-top="0"
+     fit-margin-left="0"
+     fit-margin-right="0"
+     fit-margin-bottom="0" />
+  <metadata
+     id="metadata2976">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     id="layer1"
+     inkscape:groupmode="layer"
+     inkscape:label="Layer 1"
+     transform="translate(-94.16143,-137.34221)">
+    <g
+       id="g38">
+      <path
+         sodipodi:nodetypes="ccccccccc"
+         d="m 97.313033,141.78368 -0.569661,-3.81676 21.657768,1.61708 -0.16951,2.19968 -9.43137,-0.0666 0.50168,26.27969 -4.55994,1.72073 1.5007,-27.93382 z"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:42.3333px;line-height:1.25;font-family:'News Cycle';-inkscape-font-specification:'News Cycle, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;letter-spacing:0px;fill:#ff4088;fill-opacity:1;stroke:none;stroke-width:0.264583"
+         id="path3007" />
+      <path
+         sodipodi:nodetypes="cccccsccccccc"
+         d="m 113.64059,169.39689 0.72763,-24.74618 2.19225,0.0209 v 5.87043 c 0.64768,-1.43315 1.68003,-2.43931 2.02454,-2.97675 1.35049,-2.09461 3.10059,-3.14192 5.25034,-3.14192 0.16536,0 0.41341,0.0138 0.74414,0.0413 v 2.3151 c -0.93708,0.12403 -1.71566,0.30317 -2.33578,0.53744 -0.62011,0.22049 -1.22645,0.57878 -1.81902,1.07487 -1.03353,0.85438 -2.6791,2.57711 -3.86422,5.12648 l 0.53626,14.57465 z"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:42.3333px;line-height:1.25;font-family:'News Cycle';-inkscape-font-specification:'News Cycle, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;letter-spacing:0px;fill:#ff4088;fill-opacity:1;stroke:none;stroke-width:0.264583"
+         id="path3009" />
+    </g>
+  </g>
+</svg>
diff --git a/src/manifest.json b/src/manifest.json
new file mode 100644
index 0000000..f117daa
--- /dev/null
+++ b/src/manifest.json
@@ -0,0 +1,42 @@
+{
+  "manifest_version": 2,
+  "name": "Treetop",
+  "description": "__MSG_extensionDescription__",
+  "version": "1.0.0",
+  "author": "Max Smolens",
+  "homepage_url": "https://github.com/msmolens/treetop",
+  "default_locale": "en",
+  "icons": {
+    "32": "icons/icon32.png",
+    "48": "icons/icon48.png",
+    "64": "icons/icon64.png",
+    "96": "icons/icon96.png",
+    "128": "icons/icon128.png",
+    "256": "icons/icon256.png"
+  },
+  "background": {
+    "scripts": ["background_script.bundle.js"]
+  },
+  "browser_action": {
+    "default_icon": {
+      "32": "icons/icon32.png",
+      "48": "icons/icon48.png",
+      "64": "icons/icon64.png",
+      "96": "icons/icon96.png",
+      "128": "icons/icon128.png",
+      "256": "icons/icon256.png"
+    },
+    "default_title": "Treetop"
+  },
+  "options_ui": {
+    "page": "options.html",
+    "browser_style": true
+  },
+  "permissions": ["bookmarks", "history", "menus", "storage"],
+  "browser_specific_settings": {
+    "gecko": {
+      "id": "treetop@maxsmolens.org",
+      "strict_min_version": "76.0"
+    }
+  }
+}
diff --git a/src/options/Options.svelte b/src/options/Options.svelte
new file mode 100644
index 0000000..d40c3af
--- /dev/null
+++ b/src/options/Options.svelte
@@ -0,0 +1,112 @@
+<script lang="ts">
+  import { browser } from 'webextension-polyfill-ts';
+
+  import { onMount } from 'svelte';
+
+  let options: { [key: string]: any };
+
+  const strings = {
+    general: browser.i18n.getMessage('optionHeadingGeneral'),
+    bookmarks: browser.i18n.getMessage('optionHeadingBookmarks'),
+    showBookmarksToolbar: browser.i18n.getMessage('optionShowBookmarksToolbar'),
+    showBookmarksMenu: browser.i18n.getMessage('optionShowBookmarksMenu'),
+    showOtherBookmarks: browser.i18n.getMessage('optionShowOtherBookmarks'),
+    truncate: browser.i18n.getMessage('optionTruncateLongTitles'),
+    tooltips: browser.i18n.getMessage('optionDisplayTooltips'),
+    showRecentlyVisited: browser.i18n.getMessage('optionShowRecentlyVisited'),
+  };
+
+  async function handleCheckboxChange(event: Event) {
+    const target = event.target! as HTMLInputElement;
+    const optionName = target.dataset.optionName!;
+    const value = target.checked;
+    await browser.storage.local.set({ [optionName]: value });
+  }
+
+  onMount(() => {
+    async function getOptions() {
+      options = await browser.storage.local.get();
+    }
+
+    getOptions();
+  });
+</script>
+
+<style>
+</style>
+
+{#if options}
+  <header class="panel-section panel-section-header">
+    <div class="text-section-header">{strings.general}</div>
+  </header>
+
+  <div class="panel-section panel-section-formElements">
+    <div class="browser-style">
+      <label>
+        <input
+          type="checkbox"
+          bind:checked={options.showBookmarksToolbar}
+          on:change={handleCheckboxChange}
+          data-option-name="showBookmarksToolbar" />
+        {strings.showBookmarksToolbar}
+      </label>
+    </div>
+    <div class="browser-style">
+      <label>
+        <input
+          type="checkbox"
+          bind:checked={options.showBookmarksMenu}
+          on:change={handleCheckboxChange}
+          data-option-name="showBookmarksMenu" />
+        {strings.showBookmarksMenu}
+      </label>
+    </div>
+    <div class="browser-style">
+      <label>
+        <input
+          type="checkbox"
+          bind:checked={options.showOtherBookmarks}
+          on:change={handleCheckboxChange}
+          data-option-name="showOtherBookmarks" />
+        {strings.showOtherBookmarks}
+      </label>
+    </div>
+  </div>
+
+  <header class="panel-section panel-section-header">
+    <div class="text-section-header">{strings.bookmarks}</div>
+  </header>
+
+  <div class="panel-section panel-section-formElements">
+    <div class="browser-style">
+      <label>
+        <input
+          type="checkbox"
+          bind:checked={options.truncate}
+          on:change={handleCheckboxChange}
+          data-option-name="truncate" />
+        {strings.truncate}
+      </label>
+    </div>
+    <div class="browser-style">
+      <label>
+        <input
+          type="checkbox"
+          bind:checked={options.tooltips}
+          on:change={handleCheckboxChange}
+          data-option-name="tooltips" />
+        {strings.tooltips}
+      </label>
+    </div>
+    <div class="browser-style">
+      <label>
+        <input
+          type="checkbox"
+          bind:checked={options.showRecentlyVisited}
+          on:change={handleCheckboxChange}
+          data-option-name="showRecentlyVisited" />
+        {strings.showRecentlyVisited}
+      </label>
+    </div>
+  </div>
+{/if}
diff --git a/src/options/main.ts b/src/options/main.ts
new file mode 100644
index 0000000..d96319a
--- /dev/null
+++ b/src/options/main.ts
@@ -0,0 +1,5 @@
+import Options from './Options.svelte';
+
+new Options({
+  target: document.body,
+});
diff --git a/src/setupTests.ts b/src/setupTests.ts
new file mode 100644
index 0000000..e19d528
--- /dev/null
+++ b/src/setupTests.ts
@@ -0,0 +1 @@
+import 'mockzilla-webextension';
diff --git a/src/theme/_smui-theme.scss b/src/theme/_smui-theme.scss
new file mode 100644
index 0000000..89c8dce
--- /dev/null
+++ b/src/theme/_smui-theme.scss
@@ -0,0 +1,9 @@
+@import '@material/theme/color-palette';
+
+$mdc-theme-primary: #ff4088;
+
+$mdc-typography-font-family: 'Inter', sans-serif;
+
+$mdc-dialog-min-width: 480px;
+
+$mdc-snackbar-viewport-margin-narrow: 24px;
diff --git a/src/treetop/Bookmark.svelte b/src/treetop/Bookmark.svelte
new file mode 100644
index 0000000..6c5f79f
--- /dev/null
+++ b/src/treetop/Bookmark.svelte
@@ -0,0 +1,117 @@
+<script lang="ts">
+  import type * as Treetop from './types';
+  import type { Writable } from 'svelte/store';
+
+  import { getContext } from 'svelte';
+  // FIXME: truncate is unavailable in jest when imported directly
+  // import lodashTruncate from 'lodash/truncate';
+  import { truncate as lodashTruncate } from 'lodash';
+
+  import { clock } from './clock';
+  import { truncateMiddle } from './utils';
+
+  export let nodeId: string;
+  export let title: string;
+  export let url: string;
+
+  const lastVisitTimeMap: Treetop.LastVisitTimeMap = getContext(
+    'lastVisitTimeMap'
+  );
+  const truncate = getContext('truncate') as Writable<boolean>;
+  const tooltips = getContext('tooltips') as Writable<boolean>;
+
+  let lastVisitTime = lastVisitTimeMap.get(nodeId) as Writable<number>;
+
+  // Maximum length of displayed bookmark titles and, in tooltips, URLs.
+  const maxLength = 78;
+
+  let name: string;
+  $: {
+    // Set name, truncating based on preference setting.
+    // Fall back to URL if title is blank.
+    if ($truncate) {
+      name = lodashTruncate(title || url, {
+        length: maxLength,
+        separator: ' ',
+      });
+    } else {
+      name = title || url;
+    }
+  }
+
+  let tooltip: string | undefined;
+  $: {
+    // Set tooltip if preference is enabled.
+    // Display title and URL on separate lines, truncating long URLs in the middle.
+    if ($tooltips) {
+      tooltip = `${title}\n${truncateMiddle(url, maxLength)}`;
+    } else {
+      tooltip = undefined;
+    }
+  }
+
+  // Number of milliseconds in a day
+  const MILLISECONDS_PER_DAY =
+    1000 * // ms per second
+    60 * // seconds per minute
+    60 * // minutes per hour
+    24; // hours per day
+
+  // Approximate number of days since last visit
+  let lastVisitTimeDays: number;
+  $: lastVisitTimeDays =
+    ($clock.getTime() - $lastVisitTime) / MILLISECONDS_PER_DAY;
+
+  // Set visited class based on number of days since last visit
+  let visitedClass: string;
+  $: {
+    if (lastVisitTimeDays < 1) {
+      visitedClass = 'visitedPastDay';
+    } else if (lastVisitTimeDays < 2) {
+      visitedClass = 'visitedPastTwoDays';
+    } else if (lastVisitTimeDays < 3) {
+      visitedClass = 'visitedPastThreeDays';
+    } else if (lastVisitTimeDays < 7) {
+      visitedClass = 'visitedPastWeek';
+    } else {
+      visitedClass = '';
+    }
+  }
+</script>
+
+<style>
+  a {
+    color: #212121;
+    margin-right: 1rem;
+    text-decoration: underline solid #9e9e9e 1px;
+  }
+
+  a:visited {
+    color: #212121;
+  }
+
+  a:hover {
+    color: #00f;
+    text-decoration-color: #424242;
+  }
+
+  .visitedPastDay {
+    font-size: 1.5rem;
+  }
+
+  .visitedPastTwoDays {
+    font-size: 1.4rem;
+  }
+
+  .visitedPastThreeDays {
+    font-size: 1.3rem;
+  }
+
+  .visitedPastWeek {
+    font-size: 1.1rem;
+  }
+</style>
+
+<a href={url} data-node-id={nodeId} title={tooltip} class={visitedClass}>
+  {name}
+</a>
diff --git a/src/treetop/BookmarksManager.ts b/src/treetop/BookmarksManager.ts
new file mode 100644
index 0000000..1f93941
--- /dev/null
+++ b/src/treetop/BookmarksManager.ts
@@ -0,0 +1,272 @@
+import { get, writable } from 'svelte/store';
+import { browser } from 'webextension-polyfill-ts';
+
+import {
+  BOOKMARK_TREE_NODE_TYPE_BOOKMARK,
+  BOOKMARK_TREE_NODE_TYPE_FOLDER,
+  BOOKMARK_TREE_NODE_TYPE_SEPARATOR,
+  BOOKMARKS_MENU_GUID,
+  BOOKMARKS_TOOLBAR_GUID,
+  OTHER_BOOKMARKS_GUID,
+} from './constants';
+import * as Treetop from './types';
+
+// Map bookmarks.BookmarkTreeNodeType to Treetop.NodeType
+const BookmarkTypeMap: Map<
+  browser.bookmarks.BookmarkTreeNodeType,
+  Treetop.NodeType
+> = new Map([
+  [BOOKMARK_TREE_NODE_TYPE_BOOKMARK, Treetop.NodeType.Bookmark],
+  [BOOKMARK_TREE_NODE_TYPE_FOLDER, Treetop.NodeType.Folder],
+  [BOOKMARK_TREE_NODE_TYPE_SEPARATOR, Treetop.NodeType.Separator],
+]);
+
+/**
+ * Class to initialize and manage updating bookmark node stores.
+ */
+export class BookmarksManager {
+  showBookmarksToolbar = true;
+  showBookmarksMenu = true;
+  showOtherBookmarks = true;
+
+  constructor(private readonly nodeStoreMap: Treetop.NodeStoreMap) {}
+
+  /**
+   * Load all bookmarks and initialize node stores for folders.
+   */
+  async loadBookmarks(): Promise<void> {
+    const nodes = await browser.bookmarks.getTree();
+    this.orderBookmarksRootChildren(nodes[0]);
+
+    while (nodes.length > 0) {
+      const node = nodes.pop()!;
+
+      if (node.type === BOOKMARK_TREE_NODE_TYPE_FOLDER) {
+        this.buildNodeStore(node);
+        nodes.push(...node.children!);
+      }
+    }
+  }
+
+  /**
+   * Convert a BookmarkTreeNode into a Treetop folder node. Retain the only
+   * necessary properties from the original node and its children.
+   */
+  private convertNode(
+    node: browser.bookmarks.BookmarkTreeNode
+  ): Treetop.FolderNode {
+    const newNode: Treetop.FolderNode = {
+      id: node.id,
+      parentId: node.parentId,
+      type: Treetop.NodeType.Folder,
+      title: node.title,
+      children: node.children!.map(
+        (child): Treetop.Node => {
+          let newChild: Treetop.Node;
+          const type = BookmarkTypeMap.get(child.type!)!;
+          switch (type) {
+            case Treetop.NodeType.Bookmark:
+              newChild = {
+                type,
+                id: child.id,
+                title: child.title,
+                url: child.url!,
+              };
+              break;
+            case Treetop.NodeType.Folder:
+              newChild = {
+                type,
+                id: child.id,
+                title: child.title,
+                children: [],
+              };
+              break;
+            case Treetop.NodeType.Separator:
+              newChild = {
+                type,
+                id: child.id,
+              };
+              break;
+            default:
+              throw new TypeError();
+          }
+
+          return newChild;
+        }
+      ),
+    };
+
+    return newNode;
+  }
+
+  /**
+   * Create and record a node store for the specified bookmark node.
+   */
+  private buildNodeStore(node: browser.bookmarks.BookmarkTreeNode): void {
+    if (node.type !== BOOKMARK_TREE_NODE_TYPE_FOLDER) {
+      throw new TypeError();
+    }
+
+    const newNode = this.convertNode(node);
+    const nodeStore = writable(newNode);
+    this.nodeStoreMap.set(node.id, nodeStore);
+  }
+
+  /**
+   * Update the node store for the specified bookmark ID.
+   */
+  private async updateNodeStore(nodeId: string): Promise<void> {
+    const [node] = await browser.bookmarks.get(nodeId);
+
+    if (node.type !== BOOKMARK_TREE_NODE_TYPE_FOLDER) {
+      throw new TypeError();
+    }
+
+    node.children = await browser.bookmarks.getChildren(node.id);
+
+    const newNode = this.convertNode(node);
+    const nodeStore = this.nodeStoreMap.get(nodeId)!;
+    nodeStore.set(newNode);
+  }
+
+  /**
+   * Create a store for a newly created bookmark node.
+   */
+  async handleBookmarkCreated(
+    id: string,
+    bookmark: browser.bookmarks.BookmarkTreeNode
+  ): Promise<void> {
+    if (bookmark.type === BOOKMARK_TREE_NODE_TYPE_FOLDER) {
+      // Add node store for the new folder
+      const [node] = await browser.bookmarks.get(id);
+      node.children = await browser.bookmarks.getChildren(id);
+      this.buildNodeStore(node);
+    }
+
+    // Update parent node of the new bookmark
+    await this.updateNodeStore(bookmark.parentId!);
+  }
+
+  /**
+   * Delete stores for removed bookmarks. When the removed bookmark is a folder,
+   * recursively delete stores for its children.
+   *
+   * @return Array of the removed bookmark node IDs.
+   */
+  async handleBookmarkRemoved(
+    id: string,
+    removeInfo: browser.bookmarks._OnRemovedRemoveInfo
+  ): Promise<string[]> {
+    const removedNodeIds = [];
+
+    if (removeInfo.node.type === BOOKMARK_TREE_NODE_TYPE_FOLDER) {
+      const nodeStore = this.nodeStoreMap.get(id)!;
+      const nodes: [Treetop.FolderNode] = [get(nodeStore)];
+
+      while (nodes.length) {
+        const node = nodes.pop()!;
+        this.nodeStoreMap.delete(node.id);
+        removedNodeIds.push(node.id);
+
+        // Store removed bookmark IDs
+        for (const child of node.children) {
+          if (child.type !== Treetop.NodeType.Folder) {
+            removedNodeIds.push(child.id);
+          }
+        }
+
+        // Enqueue child folders for removal
+        for (const childNodeStore of this.nodeStoreMap.values()) {
+          const currentNode: Treetop.FolderNode = get(childNodeStore);
+          if (currentNode.parentId === node.id) {
+            nodes.push(currentNode);
+          }
+        }
+      }
+    } else {
+      removedNodeIds.push(id);
+    }
+
+    // Update parent node of the deleted bookmark
+    await this.updateNodeStore(removeInfo.parentId);
+
+    return removedNodeIds;
+  }
+
+  /**
+   * Update the store for a modified bookmark.
+   */
+  async handleBookmarkChanged(
+    id: string,
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    _changeInfo: browser.bookmarks._OnChangedChangeInfo
+  ): Promise<void> {
+    if (this.nodeStoreMap.has(id)) {
+      // Folder changed. Update its node.
+      await this.updateNodeStore(id);
+    } else {
+      // Bookmark changed. Update the parent folder node.
+      const [node] = await browser.bookmarks.get(id);
+      await this.updateNodeStore(node.parentId!);
+    }
+  }
+
+  /**
+   * Update stores when a bookmark is moved to a different folder or to a new
+   * offset within its folder.
+   */
+  async handleBookmarkMoved(
+    _id: string,
+    moveInfo: browser.bookmarks._OnMovedMoveInfo
+  ): Promise<void> {
+    const parentId = moveInfo.parentId;
+    const oldParentId = moveInfo.oldParentId;
+
+    // Update parent folder
+    await this.updateNodeStore(parentId);
+
+    // Update old parent folder
+    if (parentId !== oldParentId) {
+      await this.updateNodeStore(oldParentId);
+    }
+  }
+
+  /**
+   * Order root bookmark node children like:
+   * - Bookmarks Toolbar
+   * - Bookmarks Menu
+   * - Other Bookmarks
+   *
+   * Respect preference settings for whether to include each folder.
+   *
+   * Omit Mobile Bookmarks.
+   */
+  private orderBookmarksRootChildren(
+    node: browser.bookmarks.BookmarkTreeNode
+  ): void {
+    const children: browser.bookmarks.BookmarkTreeNode[] = [];
+
+    if (this.showBookmarksToolbar) {
+      const bookmarksToolbarNode = node.children!.find(
+        ({ id }) => id === BOOKMARKS_TOOLBAR_GUID
+      )!;
+      children.push(bookmarksToolbarNode);
+    }
+
+    if (this.showBookmarksMenu) {
+      const bookmarksMenuNode = node.children!.find(
+        ({ id }) => id === BOOKMARKS_MENU_GUID
+      )!;
+      children.push(bookmarksMenuNode);
+    }
+
+    if (this.showOtherBookmarks) {
+      const otherBookmarksNode = node.children!.find(
+        ({ id }) => id === OTHER_BOOKMARKS_GUID
+      )!;
+      children.push(otherBookmarksNode);
+    }
+
+    node.children = children;
+  }
+}
diff --git a/src/treetop/ConfirmationDialog.svelte b/src/treetop/ConfirmationDialog.svelte
new file mode 100644
index 0000000..fbd01ab
--- /dev/null
+++ b/src/treetop/ConfirmationDialog.svelte
@@ -0,0 +1,47 @@
+<script lang="ts">
+  import type { MDCDialogCloseEvent } from '@material/dialog';
+
+  import Button, { Label } from '@smui/button';
+  import Dialog, { Title, Content, Actions, InitialFocus } from '@smui/dialog';
+
+  import { createEventDispatcher } from 'svelte';
+
+  const dispatch = createEventDispatcher();
+
+  export let shown: boolean = false;
+  export let title: string;
+  export let message: string;
+  export let cancelLabel: string;
+  export let confirmLabel: string;
+
+  let dialog: Dialog;
+  $: if (dialog) {
+    if (shown) {
+      dialog.open();
+    } else {
+      dialog.close();
+    }
+  }
+
+  function handleClosed(e: MDCDialogCloseEvent) {
+    const message = e.detail.action === 'confirm' ? 'confirm' : 'cancel';
+    dispatch(message);
+  }
+</script>
+
+<Dialog
+  bind:this={dialog}
+  aria-labelledby="dialog-title"
+  aria-describedby="dialog-content"
+  on:MDCDialog:closed={handleClosed}>
+  <Title id="dialog-title">{title}</Title>
+  <Content id="dialog-content">{message}</Content>
+  <Actions>
+    <Button action="cancel">
+      <Label>{cancelLabel}</Label>
+    </Button>
+    <Button action="confirm" use={[InitialFocus]}>
+      <Label>{confirmLabel}</Label>
+    </Button>
+  </Actions>
+</Dialog>
diff --git a/src/treetop/Folder.svelte b/src/treetop/Folder.svelte
new file mode 100644
index 0000000..4417762
--- /dev/null
+++ b/src/treetop/Folder.svelte
@@ -0,0 +1,162 @@
+<script lang="ts">
+  import * as Treetop from './types';
+  import type { Writable } from 'svelte/store';
+  import { browser } from 'webextension-polyfill-ts';
+
+  import { getContext } from 'svelte';
+  import { get } from 'svelte/store';
+
+  import Bookmark from './Bookmark.svelte';
+  import { BOOKMARKS_ROOT_GUID } from './constants';
+
+  export let nodeId: string;
+  export let root: boolean = false;
+
+  const nodeStoreMap: Treetop.NodeStoreMap = getContext('nodeStoreMap');
+
+  let node: Writable<Treetop.FolderNode> = nodeStoreMap.get(nodeId)!;
+
+  // Nodes for the folder heading.
+  // For the root folder, get the folder nodes from bookmarks root to the selected root.
+  // Otherwise, include only the folder node itself.
+  let folderNodes: Treetop.FolderNode[];
+  $: if (root) {
+    folderNodes = getFolderNodes($node);
+  } else {
+    folderNodes = [$node];
+  }
+
+  // Include selected root title in document title.
+  // Don't use fallback title.
+  let documentTitle: string = 'Treetop';
+  $: if (root && folderNodes) {
+    const rootFolderTitle = folderNodes[folderNodes.length - 1].title;
+    if (rootFolderTitle) {
+      documentTitle = `Treetop: ${rootFolderTitle}`;
+    }
+  }
+
+  /**
+   * Get folder nodes from bookmarks root to the selected root.
+   */
+  function getFolderNodes(node: Treetop.FolderNode): Treetop.FolderNode[] {
+    const nodes = [node];
+
+    while (node.parentId) {
+      const nodeStore = nodeStoreMap.get(node.parentId)!;
+      node = get(nodeStore);
+      nodes.unshift(node);
+    }
+
+    return nodes;
+  }
+
+  /**
+   * When a folder node has no title, get a fallback string.
+   */
+  function getFallbackTitle(nodeId: string): string {
+    let key;
+
+    if (nodeId === BOOKMARKS_ROOT_GUID) {
+      key = 'bookmarks';
+    } else {
+      key = 'folderNoTitle';
+    }
+
+    return browser.i18n.getMessage(key);
+  }
+
+  //
+  // Workarounds for issue using non-null assertion operator (!) in template
+  // https://github.com/sveltejs/svelte/issues/4701
+  //
+  $: children = $node.children;
+
+  function getUrl(child: Treetop.BookmarkNode): string {
+    return child.url;
+  }
+</script>
+
+<style>
+  .folder {
+    margin-left: 1rem;
+    margin-top: 1rem;
+  }
+
+  .root {
+    margin-left: 0;
+    margin-top: 0;
+  }
+
+  .heading {
+    background-color: #1074e7;
+    border-radius: 0.5rem;
+    border: 1px solid #1074e7;
+    color: #fff;
+    display: inline-block;
+    font-size: 1.25rem;
+    line-height: 1.15;
+    padding: 0.5rem 0.75rem;
+    white-space: nowrap;
+  }
+
+  .heading:hover {
+    background-color: #0366d6;
+    border-color: #0366d6;
+  }
+
+  .title {
+    display: flex;
+  }
+  .title a:link {
+    color: #fff;
+    text-decoration: none;
+  }
+  .title a:visited {
+    color: #fff;
+  }
+  .title a:hover {
+    text-decoration: underline;
+  }
+
+  .contents {
+    line-height: 1.75;
+    margin: 1rem 0 1rem 1rem;
+  }
+
+  hr {
+    border: 1px solid #9e9e9e;
+    border-width: 1px;
+    margin: 0.5rem auto;
+  }
+</style>
+
+<svelte:head>
+  <title>{documentTitle}</title>
+</svelte:head>
+
+{#if $node}
+  <div class="folder" class:root>
+    <div class="heading">
+      <div class="title">
+        {#each folderNodes as { id, title }, i (id)}
+          <a href="#{id || ''}" data-node-id={id}>
+            {title || getFallbackTitle(id)}
+          </a>
+          {#if i < folderNodes.length - 1}&nbsp;/&nbsp;{/if}
+        {/each}
+      </div>
+    </div>
+    <div class="contents">
+      {#each children as child (child.id)}
+        {#if child.type === Treetop.NodeType.Bookmark}
+          <Bookmark nodeId={child.id} title={child.title} url={getUrl(child)} />
+        {:else if child.type === Treetop.NodeType.Folder}
+          <svelte:self nodeId={child.id} />
+        {:else if child.type === Treetop.NodeType.Separator}
+          <hr />
+        {/if}
+      {:else}<em>{browser.i18n.getMessage('emptyFolder')}</em>{/each}
+    </div>
+  </div>
+{/if}
diff --git a/src/treetop/HistoryManager.ts b/src/treetop/HistoryManager.ts
new file mode 100644
index 0000000..7be792b
--- /dev/null
+++ b/src/treetop/HistoryManager.ts
@@ -0,0 +1,168 @@
+import { get, writable } from 'svelte/store';
+import { browser } from 'webextension-polyfill-ts';
+
+import { BOOKMARK_TREE_NODE_TYPE_BOOKMARK } from './constants';
+import * as Treetop from './types';
+
+/**
+ * Class to initialize and manage updating last visit time stores for bookmarks.
+ */
+export class HistoryManager {
+  private loaded = false;
+
+  constructor(private readonly lastVisitTimeMap: Treetop.LastVisitTimeMap) {}
+
+  /**
+   * Initialize default last visit time stores for all bookmark nodes.
+   */
+  init(nodeStoreMap: Treetop.NodeStoreMap): void {
+    for (const nodeStore of nodeStoreMap.values()) {
+      const node: Treetop.FolderNode = get(nodeStore);
+      node.children.forEach((child) => {
+        if (child.type === Treetop.NodeType.Bookmark) {
+          this.lastVisitTimeMap.set(child.id, writable(0));
+        }
+      });
+    }
+  }
+
+  /**
+   * Load history for all bookmarks and initialize last visit time stores.
+   */
+  async loadHistory(nodeStoreMap: Treetop.NodeStoreMap): Promise<void> {
+    if (this.loaded) {
+      return;
+    }
+
+    // Parallel arrays
+    const nodeIds: string[] = [];
+    const promises: Promise<browser.history.VisitItem[]>[] = [];
+
+    //
+    // Get last visit time of bookmarked URLs
+    //
+
+    for (const nodeStore of nodeStoreMap.values()) {
+      const node: Treetop.FolderNode = get(nodeStore);
+      node.children.forEach((child) => {
+        if (child.type === Treetop.NodeType.Bookmark) {
+          const promise = browser.history.getVisits({
+            url: child.url,
+          });
+          promises.push(promise);
+          nodeIds.push(child.id);
+        }
+      });
+    }
+
+    // Update last visit times
+    const results = await Promise.all(promises);
+    results.forEach((items, index) => {
+      if (items.length > 0) {
+        const lastVisitTime = this.lastVisitTimeMap.get(nodeIds[index])!;
+        lastVisitTime.set(items[0].visitTime!);
+      }
+    });
+
+    this.loaded = true;
+  }
+
+  /**
+   * Reset all last visit time stores.
+   */
+  unloadHistory(): void {
+    for (const lastVisitTime of this.lastVisitTimeMap.values()) {
+      lastVisitTime.set(0);
+    }
+
+    this.loaded = false;
+  }
+
+  /**
+   * Create a last visit time store for a newly created bookmark node.
+   */
+  async handleBookmarkCreated(
+    _id: string,
+    bookmark: browser.bookmarks.BookmarkTreeNode
+  ): Promise<void> {
+    if (bookmark.type !== BOOKMARK_TREE_NODE_TYPE_BOOKMARK) {
+      return;
+    }
+
+    const items = await browser.history.getVisits({
+      url: bookmark.url!,
+    });
+
+    const visitTime = items.length > 0 ? items[0].visitTime! : 0;
+    const lastVisitTime = writable(visitTime);
+    this.lastVisitTimeMap.set(bookmark.id, lastVisitTime);
+  }
+
+  /**
+   * Delete the last visit time store for a removed bookmark.
+   */
+  handleBookmarkRemoved(id: string): void {
+    this.lastVisitTimeMap.delete(id);
+  }
+
+  /**
+   * Update the last visit time store for a modified bookmark.
+   */
+  async handleBookmarkChanged(
+    id: string,
+    changeInfo: browser.bookmarks._OnChangedChangeInfo
+  ): Promise<void> {
+    // Ignore changed folders
+    if (changeInfo.url === undefined) {
+      return;
+    }
+
+    const items = await browser.history.getVisits({
+      url: changeInfo.url,
+    });
+
+    const lastVisitTime = this.lastVisitTimeMap.get(id)!;
+    const newLastVisitTime = items.length > 0 ? items[0].visitTime! : 0;
+    lastVisitTime.set(newLastVisitTime);
+  }
+
+  /**
+   * Update the last visit time store when the user visits a bookmarked URL.
+   */
+  async handleVisited(result: browser.history.HistoryItem): Promise<void> {
+    // Update bookmark nodes that match the visited URL
+    const nodes = await browser.bookmarks.search({
+      url: result.url,
+    });
+
+    nodes.forEach((node) => {
+      const lastVisitTime = this.lastVisitTimeMap.get(node.id)!;
+      lastVisitTime.set(result.lastVisitTime!);
+    });
+  }
+
+  /**
+   * Reset the last visit time stores when a page is removed from the browser
+   * history.
+   */
+  async handleVisitRemoved(
+    removed: browser.history._OnVisitRemovedRemoved
+  ): Promise<void> {
+    if (removed.allHistory) {
+      // All history was removed
+      for (const lastVisitTime of this.lastVisitTimeMap.values()) {
+        lastVisitTime.set(0);
+      }
+    } else {
+      // Get bookmark nodes that match the removed URL
+      const nodes = await browser.bookmarks.search({
+        url: removed.urls[0],
+      });
+
+      nodes.forEach((node) => {
+        const lastVisitTime = this.lastVisitTimeMap.get(node.id)!;
+        lastVisitTime.set(0);
+      });
+    }
+  }
+}
diff --git a/src/treetop/PageFooter.svelte b/src/treetop/PageFooter.svelte
new file mode 100644
index 0000000..b3051fa
--- /dev/null
+++ b/src/treetop/PageFooter.svelte
@@ -0,0 +1,11 @@
+<style>
+  hr {
+    border: 1px solid #757575;
+    margin: 2rem auto;
+    width: calc(100% / 3);
+  }
+</style>
+
+<footer>
+  <hr />
+</footer>
diff --git a/src/treetop/PageHeader.svelte b/src/treetop/PageHeader.svelte
new file mode 100644
index 0000000..c50e9ad
--- /dev/null
+++ b/src/treetop/PageHeader.svelte
@@ -0,0 +1,51 @@
+<script lang="ts">
+  import IconButton from '@smui/icon-button';
+  import { elasticOut } from 'svelte/easing';
+  import { fly } from 'svelte/transition';
+  import { browser } from 'webextension-polyfill-ts';
+
+  function openPreferences() {
+    browser.runtime.openOptionsPage();
+  }
+</script>
+
+<style>
+  header {
+    display: flex;
+    margin: 0 1rem;
+  }
+
+  .treetop {
+    color: #24292e;
+    flex: 1;
+    font-family: 'News Cycle', sans-serif;
+    font-size: 3rem;
+    font-weight: 400;
+    letter-spacing: -0.1rem;
+    text-decoration: solid #ff4088 underline 3px;
+    text-underline-offset: 3px;
+    user-select: none;
+  }
+
+  .preferences {
+    padding: 0.5rem;
+  }
+</style>
+
+<header>
+  <div
+    class="treetop"
+    transition:fly={{ y: -72, duration: 1200, easing: elasticOut, opacity: 1 }}>
+    Treetop
+  </div>
+  <div>
+    <div class="preferences">
+      <IconButton
+        aria-label={browser.i18n.getMessage('preferences')}
+        class="material-icons"
+        on:click={openPreferences}>
+        settings
+      </IconButton>
+    </div>
+  </div>
+</header>
diff --git a/src/treetop/PreferencesManager.ts b/src/treetop/PreferencesManager.ts
new file mode 100644
index 0000000..1777527
--- /dev/null
+++ b/src/treetop/PreferencesManager.ts
@@ -0,0 +1,73 @@
+import { Writable, writable } from 'svelte/store';
+import { browser } from 'webextension-polyfill-ts';
+
+import type * as Treetop from './types';
+
+/**
+ * Class to create and manage updating preference stores.
+ */
+export class PreferencesManager {
+  private readonly stores = new Map<
+    string,
+    Writable<Treetop.PreferenceValue>
+  >();
+
+  // Bound event handler
+  private readonly onChanged = (
+    changes: { [key: string]: browser.storage.StorageChange },
+    areaName: string
+  ) => this.handleStorageChanged(changes, areaName);
+
+  constructor() {
+    // Register storage event handler
+    browser.storage.onChanged.addListener(this.onChanged);
+  }
+
+  /**
+   * Create and register a store.
+   */
+  createStore(
+    name: string,
+    value: Treetop.PreferenceValue
+  ): Writable<Treetop.PreferenceValue> {
+    const store = writable(value);
+    this.stores.set(name, store);
+    return store;
+  }
+
+  /**
+   * Load preferences from storage and initialize stores.
+   */
+  async loadPreferences(): Promise<void> {
+    // Get preferences from storage
+    const results = await browser.storage.local.get();
+
+    // Initialize stores
+    for (const key of Object.keys(results)) {
+      const value = results[key] as Treetop.PreferenceValue;
+
+      const store = this.stores.get(key);
+      if (store !== undefined) {
+        store.set(value);
+      }
+    }
+  }
+
+  /**
+   * Update preferences stores when storage values change.
+   */
+  handleStorageChanged(
+    changes: { [key: string]: browser.storage.StorageChange },
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    _areaName: string
+  ): void {
+    for (const key of Object.keys(changes)) {
+      const value = changes[key].newValue as Treetop.PreferenceValue;
+
+      const store = this.stores.get(key);
+      if (store !== undefined) {
+        store.set(value);
+      }
+    }
+  }
+}
diff --git a/src/treetop/PropertiesDialog.svelte b/src/treetop/PropertiesDialog.svelte
new file mode 100644
index 0000000..07708ac
--- /dev/null
+++ b/src/treetop/PropertiesDialog.svelte
@@ -0,0 +1,112 @@
+<script lang="ts">
+  import type * as Treetop from './types';
+  import { browser } from 'webextension-polyfill-ts';
+  import type { MDCDialogCloseEvent } from '@material/dialog';
+
+  import Button, { Label } from '@smui/button';
+  import Dialog, { Title, Content, Actions } from '@smui/dialog';
+  import TextField from '@smui/textfield';
+
+  import { createEventDispatcher } from 'svelte';
+  import truncate from 'lodash/truncate';
+
+  const dispatch = createEventDispatcher();
+
+  export let shown: boolean = false;
+  export let title: string;
+  export let url: string | undefined;
+
+  let dialog: Dialog;
+  let nameLabel: TextField;
+  $: if (dialog) {
+    if (shown) {
+      dialog.open();
+      nameLabel.focus();
+      // TODO: Select all text in name label
+    } else {
+      dialog.close();
+    }
+  }
+
+  function handleClosed(e: MDCDialogCloseEvent) {
+    if (e.detail.action === 'save') {
+      save();
+    } else {
+      dispatch('cancel');
+    }
+  }
+
+  const maxHeaderTitleLength = 58;
+
+  //
+  // Dialog strings
+  //
+
+  const cancelLabel = browser.i18n.getMessage('dialogButtonCancel');
+  const saveLabel = browser.i18n.getMessage('dialogButtonSave');
+
+  let header: string;
+  $: if (title) {
+    // Truncate bookmark title
+    const truncatedTitle = truncate(title, {
+      length: maxHeaderTitleLength,
+    });
+    header = browser.i18n.getMessage(
+      'dialogHeadingBookmarkProperties',
+      truncatedTitle
+    );
+  }
+
+  //
+  // Bookmark properties
+  //
+
+  $: editTitle = title;
+  $: editUrl = url;
+
+  // Dispatch event to save changes
+  function save() {
+    const changes: Treetop.PropertiesChanges = {
+      title: editTitle,
+    };
+
+    if (editUrl !== undefined && editUrl.length > 0) {
+      // TODO: Could fix URL like firefox-78-0.1/docshell/base/URIFixup.jsm#L269
+      changes.url = editUrl;
+    }
+
+    dispatch('save', changes);
+  }
+</script>
+
+<Dialog
+  bind:this={dialog}
+  aria-labelledby="dialog-title"
+  aria-describedby="dialog-content"
+  on:MDCDialog:closed={handleClosed}>
+  <Title id="dialog-title">{header}</Title>
+  <Content id="dialog-content">
+    <div>
+      <TextField
+        bind:this={nameLabel}
+        bind:value={editTitle}
+        label="Name"
+        style="width: 100%;" />
+    </div>
+    {#if url !== undefined}
+      <div>
+        <TextField bind:value={editUrl} label="Location" style="width: 100%;" />
+      </div>
+    {/if}
+  </Content>
+  <Actions>
+    <Button action="cancel">
+      <Label>{cancelLabel}</Label>
+    </Button>
+    <Button
+      action="save"
+      disabled={editUrl !== undefined && editUrl.length === 0}>
+      <Label>{saveLabel}</Label>
+    </Button>
+  </Actions>
+</Dialog>
diff --git a/src/treetop/Treetop.svelte b/src/treetop/Treetop.svelte
new file mode 100644
index 0000000..e0f04ff
--- /dev/null
+++ b/src/treetop/Treetop.svelte
@@ -0,0 +1,485 @@
+<script lang="ts">
+  import * as Treetop from './types';
+  import { browser } from 'webextension-polyfill-ts';
+
+  import { onMount, onDestroy, setContext } from 'svelte';
+  import { get } from 'svelte/store';
+  import { fade } from 'svelte/transition';
+  import LinearProgress from '@smui/linear-progress';
+  import Snackbar, { Label } from '@smui/snackbar';
+
+  import icon from '../icons/generated/icon.svg';
+
+  import Folder from './Folder.svelte';
+  import PageFooter from './PageFooter.svelte';
+  import PageHeader from './PageHeader.svelte';
+
+  import { BookmarksManager } from './BookmarksManager';
+  import ConfirmationDialog from './ConfirmationDialog.svelte';
+  import { HistoryManager } from './HistoryManager';
+  import { PreferencesManager } from './PreferencesManager';
+  import PropertiesDialog from './PropertiesDialog.svelte';
+
+  import { MenuManager } from './menus/MenuManager';
+  import { DeleteMenuItem } from './menus/DeleteMenuItem';
+  import { OpenAllInTabsMenuItem } from './menus/OpenAllInTabsMenuItem';
+  import { PropertiesMenuItem } from './menus/PropertiesMenuItem';
+
+  import { BOOKMARKS_ROOT_GUID } from './constants';
+
+  export let rootBookmarkId: string | null;
+
+  //
+  // Init preferences
+  //
+
+  const preferencesManager = new PreferencesManager();
+  const showBookmarksToolbar = preferencesManager.createStore(
+    'showBookmarksToolbar',
+    true
+  );
+  const showBookmarksMenu = preferencesManager.createStore(
+    'showBookmarksMenu',
+    true
+  );
+  const showOtherBookmarks = preferencesManager.createStore(
+    'showOtherBookmarks',
+    true
+  );
+  const truncate = preferencesManager.createStore('truncate', true);
+  const tooltips = preferencesManager.createStore('tooltips', true);
+  const showRecentlyVisited = preferencesManager.createStore(
+    'showRecentlyVisited',
+    true
+  );
+
+  // Make select preferences available to other components
+  setContext('truncate', truncate);
+  setContext('tooltips', tooltips);
+
+  // Function to unsubscribe from the 'showRecentlyVisited' preference
+  let unsubscribeShowRecentlyVisited: Treetop.SvelteStoreUnsubscriber;
+
+  //
+  // Create bookmarks data and manager
+  //
+
+  // ID to node store map.
+  // Populated with a store for each folder.
+  const nodeStoreMap: Treetop.NodeStoreMap = new Map();
+
+  // ID to last visit time map.
+  // Populated with a store for each bookmark.
+  const lastVisitTimeMap: Treetop.LastVisitTimeMap = new Map();
+
+  // Bookmarks manager
+  const bookmarksManager = new BookmarksManager(nodeStoreMap);
+
+  // History manager
+  const historyManager = new HistoryManager(lastVisitTimeMap);
+
+  // Make bookmark node and history data available to other components
+  setContext('nodeStoreMap', nodeStoreMap);
+  setContext('lastVisitTimeMap', lastVisitTimeMap);
+
+  //
+  // Error notification
+  //
+
+  let errorSnackbar: Snackbar;
+  let errorMessage: string | null;
+
+  //
+  // Delete folder confirmation dialog
+  //
+
+  const deleteFolderDialogInfo = {
+    shown: false,
+    title: browser.i18n.getMessage('dialogHeadingDeleteFolder'),
+    message: browser.i18n.getMessage('dialogMessageDeleteFolder'),
+    cancelLabel: browser.i18n.getMessage('dialogButtonCancel'),
+    confirmLabel: browser.i18n.getMessage('dialogButtonDelete'),
+  };
+  let deleteFolderId: string | null;
+
+  //
+  // Properties dialog
+  //
+
+  const propertiesDialogInfo = {
+    shown: false,
+  };
+  let propertiesNode: browser.bookmarks.BookmarkTreeNode | null = null;
+
+  //
+  // Menu manager
+  //
+
+  let menuManager: MenuManager | null = null;
+
+  /**
+   * Show an error notification.
+   */
+  function handleError(err: Error | string) {
+    errorMessage = err.toString();
+    errorSnackbar.open();
+  }
+
+  /**
+   * Open a folder's immediate children in tabs.
+   */
+  function openAllInTabs(nodeId: string) {
+    const nodeStore = nodeStoreMap.get(nodeId)!;
+    const node: Treetop.FolderNode = get(nodeStore);
+
+    node.children.forEach((child) => {
+      if (child.type === Treetop.NodeType.Bookmark) {
+        browser.tabs.create({
+          url: child.url,
+        });
+      }
+    });
+  }
+
+  /**
+   * Show the properties dialog for a bookmark or folder.
+   */
+  async function showPropertiesDialog(nodeId: string) {
+    try {
+      [propertiesNode] = await browser.bookmarks.get(nodeId);
+    } catch (err) {
+      console.error(err);
+      handleError(browser.i18n.getMessage('errorRetrievingBookmark'));
+    }
+
+    propertiesDialogInfo.shown = true;
+  }
+
+  /**
+   * Properties dialog cancel handler.
+   */
+  function cancelProperties() {
+    propertiesDialogInfo.shown = false;
+    propertiesNode = null;
+  }
+
+  /**
+   * Properties dialog save handler.
+   */
+  async function saveProperties(event: CustomEvent<Treetop.PropertiesChanges>) {
+    propertiesDialogInfo.shown = false;
+
+    const changes = event.detail;
+
+    try {
+      await browser.bookmarks.update(propertiesNode!.id, changes);
+    } catch (err) {
+      console.error(err);
+      handleError(browser.i18n.getMessage('errorSavingBookmark'));
+    }
+
+    propertiesNode = null;
+  }
+
+  /**
+   * Delete a bookmark or folder. When deleting a non-empty folder, show a
+   * confirmation dialog.
+   */
+  function deleteBookmark(nodeId: string) {
+    const nodeStore = nodeStoreMap.get(nodeId);
+    if (nodeStore !== undefined) {
+      // Folder
+      const node = get(nodeStore) as Treetop.FolderNode;
+      if (node.children.length === 0) {
+        browser.bookmarks.remove(nodeId);
+      } else {
+        deleteFolderId = nodeId;
+        deleteFolderDialogInfo.shown = true;
+      }
+    } else {
+      // Bookmark
+      browser.bookmarks.remove(nodeId);
+    }
+  }
+
+  /**
+   * Delete folder confirmation dialog cancel handler.
+   */
+  function cancelDeleteBookmark() {
+    deleteFolderDialogInfo.shown = false;
+    deleteFolderId = null;
+  }
+
+  /**
+   * Delete folder confirmation dialog confirm handler.
+   */
+  function confirmDeleteBookmark() {
+    deleteFolderDialogInfo.shown = false;
+    browser.bookmarks.removeTree(deleteFolderId!);
+    deleteFolderId = null;
+  }
+
+  /**
+   * Reload when hash changes to update for new root bookmark node.
+   */
+  function onHashChange() {
+    window.location.reload();
+  }
+
+  //
+  // Bookmark event handlers
+  //
+
+  function onBookmarkCreated(
+    id: string,
+    bookmark: browser.bookmarks.BookmarkTreeNode
+  ) {
+    bookmarksManager.handleBookmarkCreated(id, bookmark);
+
+    if ($showRecentlyVisited) {
+      historyManager.handleBookmarkCreated(id, bookmark);
+    }
+  }
+
+  async function onBookmarkRemoved(
+    id: string,
+    removeInfo: browser.bookmarks._OnRemovedRemoveInfo
+  ) {
+    const removedNodeIds = await bookmarksManager.handleBookmarkRemoved(
+      id,
+      removeInfo
+    );
+
+    if ($showRecentlyVisited) {
+      removedNodeIds.forEach((nodeId) =>
+        historyManager.handleBookmarkRemoved(nodeId)
+      );
+    }
+  }
+
+  function onBookmarkChanged(
+    id: string,
+    changeInfo: browser.bookmarks._OnChangedChangeInfo
+  ) {
+    bookmarksManager.handleBookmarkChanged(id, changeInfo);
+
+    if ($showRecentlyVisited) {
+      historyManager.handleBookmarkChanged(id, changeInfo);
+    }
+  }
+
+  function onBookmarkMoved(
+    id: string,
+    moveInfo: browser.bookmarks._OnMovedMoveInfo
+  ) {
+    bookmarksManager.handleBookmarkMoved(id, moveInfo);
+  }
+
+  //
+  // History event handlers
+  //
+
+  function onVisited(result: browser.history.HistoryItem) {
+    if ($showRecentlyVisited) {
+      historyManager.handleVisited(result);
+    }
+  }
+
+  function onVisitRemoved(removed: browser.history._OnVisitRemovedRemoved) {
+    if ($showRecentlyVisited) {
+      historyManager.handleVisitRemoved(removed);
+    }
+  }
+
+  //
+  // Menu event handlers
+  //
+
+  async function onMenuShown(
+    info: browser.menus._OnShownInfo,
+    tab: browser.tabs.Tab
+  ) {
+    return menuManager?.handleMenuShown(info, tab);
+  }
+
+  function onMenuHidden() {
+    menuManager?.handleMenuHidden();
+  }
+
+  async function onMenuClicked(
+    info: browser.menus.OnClickData,
+    tab?: browser.tabs.Tab
+  ) {
+    return menuManager?.handleMenuClicked(info, tab);
+  }
+
+  /**
+   * Initialize page.
+   * Return validated root bookmark ID.
+   */
+  async function init() {
+    try {
+      await preferencesManager.loadPreferences();
+    } catch (err) {
+      console.error(err);
+      handleError(browser.i18n.getMessage('errorLoadingPreferences'));
+    }
+
+    // Configure bookmarks manager
+    bookmarksManager.showBookmarksToolbar = $showBookmarksToolbar as boolean;
+    bookmarksManager.showBookmarksMenu = $showBookmarksMenu as boolean;
+    bookmarksManager.showOtherBookmarks = $showOtherBookmarks as boolean;
+
+    // Register bookmark event handlers
+    browser.bookmarks.onCreated.addListener(onBookmarkCreated);
+    browser.bookmarks.onRemoved.addListener(onBookmarkRemoved);
+    browser.bookmarks.onChanged.addListener(onBookmarkChanged);
+    browser.bookmarks.onMoved.addListener(onBookmarkMoved);
+
+    // Register history event handlers
+    browser.history.onVisited.addListener(onVisited);
+    browser.history.onVisitRemoved.addListener(onVisitRemoved);
+
+    // Load bookmarks
+    try {
+      await bookmarksManager.loadBookmarks();
+    } catch (err) {
+      console.error(err);
+      handleError(browser.i18n.getMessage('errorLoadingBookmarks'));
+    }
+
+    // Load history
+    try {
+      historyManager.init(nodeStoreMap);
+      if ($showRecentlyVisited) {
+        await historyManager.loadHistory(nodeStoreMap);
+      }
+    } catch (err) {
+      console.error(err);
+      handleError(browser.i18n.getMessage('errorLoadingHistory'));
+    }
+
+    // Initialize or reset history manager when 'showRecentlyVisited' preference changes
+    unsubscribeShowRecentlyVisited = showRecentlyVisited.subscribe((value) => {
+      if (value) {
+        try {
+          historyManager.loadHistory(nodeStoreMap);
+        } catch (err) {
+          console.error(err);
+          handleError(browser.i18n.getMessage('errorLoadingHistory'));
+        }
+      } else {
+        historyManager.unloadHistory();
+      }
+    });
+
+    // Validate specified root bookmark ID, falling back to bookmarks root
+    if (!rootBookmarkId || !nodeStoreMap.has(rootBookmarkId)) {
+      rootBookmarkId = BOOKMARKS_ROOT_GUID;
+    }
+
+    return rootBookmarkId;
+  }
+
+  onMount(() => {
+    // Register menu event handlers
+    // @ts-expect-error: See https://github.com/jsmnbom/definitelytyped-firefox-webext-browser/pull/37
+    browser.menus.onShown.addListener(onMenuShown);
+    browser.menus.onHidden.addListener(onMenuHidden);
+    browser.menus.onClicked.addListener(onMenuClicked);
+
+    // Initialize menu manager
+    menuManager = new MenuManager();
+    menuManager.registerMenuItem('delete', new DeleteMenuItem(deleteBookmark));
+    menuManager.registerMenuItem(
+      'openAllInTabs',
+      new OpenAllInTabsMenuItem(nodeStoreMap, openAllInTabs)
+    );
+    menuManager.registerMenuItem(
+      'properties',
+      new PropertiesMenuItem(showPropertiesDialog)
+    );
+
+    window.addEventListener('hashchange', onHashChange);
+  });
+
+  onDestroy(() => {
+    // Unsubscribe from the 'showRecentlyVisited' option
+    unsubscribeShowRecentlyVisited();
+
+    // Unregister menu event handlers
+    // @ts-expect-error: See https://github.com/jsmnbom/definitelytyped-firefox-webext-browser/pull/37
+    browser.menus.onShown.removeListener(onMenuShown);
+    browser.menus.onHidden.removeListener(onMenuHidden);
+    browser.menus.onClicked.removeListener(onMenuClicked);
+
+    // Destroy menu manager
+    menuManager = null;
+
+    window.removeEventListener('hashchange', onHashChange);
+  });
+
+  // Initialize Treetop
+  let ready = init();
+</script>
+
+<style>
+  .progressContainer {
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    height: 100vh;
+    margin: auto;
+    flex-direction: column;
+  }
+  .progressContainer > img {
+    width: 4%;
+    min-width: 64px;
+    margin: 8px;
+  }
+  .progress {
+    width: 12%;
+    min-width: 100px;
+  }
+
+  .treetopContainer {
+    margin: 0 1rem;
+    padding-top: 1.5rem;
+  }
+</style>
+
+{#await ready}
+  <div class="progressContainer">
+    <img src={icon} alt="Treetop Icon" />
+    <div class="progress">
+      <LinearProgress indeterminate />
+    </div>
+  </div>
+{:then rootNodeId}
+  <PageHeader />
+  <main
+    class="treetopContainer"
+    transition:fade={{ delay: 100, duration: 250 }}>
+    <Folder nodeId={rootNodeId} root={true} />
+  </main>
+  <PageFooter />
+
+  <!-- Delete folder confirmation dialog -->
+  <ConfirmationDialog
+    {...deleteFolderDialogInfo}
+    on:cancel={cancelDeleteBookmark}
+    on:confirm={confirmDeleteBookmark} />
+
+  <!-- Bookmark properties dialog -->
+  <PropertiesDialog
+    {...propertiesDialogInfo}
+    title={propertiesNode ? propertiesNode.title : ''}
+    url={propertiesNode ? propertiesNode.url : ''}
+    on:cancel={cancelProperties}
+    on:save={saveProperties} />
+{/await}
+
+<!-- Error notification -->
+<Snackbar bind:this={errorSnackbar} leading labelText={errorMessage}>
+  <Label />
+</Snackbar>
diff --git a/src/treetop/clock.ts b/src/treetop/clock.ts
new file mode 100644
index 0000000..4c2f385
--- /dev/null
+++ b/src/treetop/clock.ts
@@ -0,0 +1,21 @@
+import { readable } from 'svelte/store';
+
+// Number of milliseconds in an hour
+export const MILLISECONDS_PER_HOUR =
+  1000 * // ms per second
+  60 * // seconds per minute
+  60; // minutes per hour
+
+/**
+ * Readable store that provides the current time. The value updates only once
+ * per hour.
+ */
+export const clock = readable(new Date(), (set) => {
+  const interval = setInterval(() => {
+    set(new Date());
+  }, MILLISECONDS_PER_HOUR);
+
+  return () => {
+    clearInterval(interval);
+  };
+});
diff --git a/src/treetop/constants.ts b/src/treetop/constants.ts
new file mode 100644
index 0000000..2ca0a92
--- /dev/null
+++ b/src/treetop/constants.ts
@@ -0,0 +1,13 @@
+// Bookmark roots have special permanent GUIDs, see
+// firefox-78.0.1/toolkit/components/places/Bookmarks.jsm#L155-159
+export const BOOKMARKS_ROOT_GUID = 'root________';
+export const BOOKMARKS_TOOLBAR_GUID = 'toolbar_____';
+export const BOOKMARKS_MENU_GUID = 'menu________';
+export const MOBILE_BOOKMARKS_GUID = 'mobile______';
+export const OTHER_BOOKMARKS_GUID = 'unfiled_____';
+
+// bookmarks.BookmarkTreeNodeType strings
+// https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/bookmarks/BookmarkTreeNodeType
+export const BOOKMARK_TREE_NODE_TYPE_BOOKMARK = 'bookmark';
+export const BOOKMARK_TREE_NODE_TYPE_FOLDER = 'folder';
+export const BOOKMARK_TREE_NODE_TYPE_SEPARATOR = 'separator';
diff --git a/src/treetop/fonts.css b/src/treetop/fonts.css
new file mode 100644
index 0000000..2c0877d
--- /dev/null
+++ b/src/treetop/fonts.css
@@ -0,0 +1,3 @@
+@import url('./fonts/News-Cycle/News-Cycle.css');
+@import url('./fonts/Inter/Inter.css');
+@import url('./fonts/MaterialIcons/MaterialIcons.css');
diff --git a/src/treetop/main.css b/src/treetop/main.css
new file mode 100644
index 0000000..25c0ae6
--- /dev/null
+++ b/src/treetop/main.css
@@ -0,0 +1,3 @@
+body {
+  font-family: 'Inter', sans-serif;
+}
diff --git a/src/treetop/main.ts b/src/treetop/main.ts
new file mode 100644
index 0000000..0f30022
--- /dev/null
+++ b/src/treetop/main.ts
@@ -0,0 +1,17 @@
+// Import fonts first so @import url() statements are at top of bundled CSS.
+// eslint-disable-next-line simple-import-sort/sort
+import './fonts.css';
+import 'normalize.css/normalize.css';
+import './main.css';
+
+import Treetop from './Treetop.svelte';
+
+// Get root bookmark ID from hash
+const rootBookmarkId = decodeURIComponent(location.hash.substr(1));
+
+new Treetop({
+  target: document.body,
+  props: {
+    rootBookmarkId,
+  },
+});
diff --git a/src/treetop/menus/DeleteMenuItem.ts b/src/treetop/menus/DeleteMenuItem.ts
new file mode 100644
index 0000000..5defb94
--- /dev/null
+++ b/src/treetop/menus/DeleteMenuItem.ts
@@ -0,0 +1,28 @@
+import {
+  BOOKMARKS_MENU_GUID,
+  BOOKMARKS_ROOT_GUID,
+  BOOKMARKS_TOOLBAR_GUID,
+  OTHER_BOOKMARKS_GUID,
+} from '@Treetop/treetop/constants';
+
+import type { OnClickedCallback } from './MenuItem';
+import { MenuItem } from './MenuItem';
+
+/**
+ * Menu item to delete a bookmark or folder.
+ */
+export class DeleteMenuItem extends MenuItem {
+  constructor(onClickedCallback: OnClickedCallback) {
+    super(onClickedCallback);
+  }
+
+  enabled(nodeId: string): boolean {
+    // Disable deleting special bookmark roots
+    return (
+      nodeId !== BOOKMARKS_ROOT_GUID &&
+      nodeId !== BOOKMARKS_TOOLBAR_GUID &&
+      nodeId !== BOOKMARKS_MENU_GUID &&
+      nodeId !== OTHER_BOOKMARKS_GUID
+    );
+  }
+}
diff --git a/src/treetop/menus/MenuItem.ts b/src/treetop/menus/MenuItem.ts
new file mode 100644
index 0000000..c5d6053
--- /dev/null
+++ b/src/treetop/menus/MenuItem.ts
@@ -0,0 +1,13 @@
+export interface OnClickedCallback {
+  (nodeId: string): void;
+}
+
+export abstract class MenuItem {
+  constructor(private readonly onClickedCallback: OnClickedCallback) {}
+
+  abstract enabled(nodeId: string): boolean;
+
+  onClicked(nodeId: string): void {
+    this.onClickedCallback(nodeId);
+  }
+}
diff --git a/src/treetop/menus/MenuManager.ts b/src/treetop/menus/MenuManager.ts
new file mode 100644
index 0000000..88b5aef
--- /dev/null
+++ b/src/treetop/menus/MenuManager.ts
@@ -0,0 +1,124 @@
+import { browser } from 'webextension-polyfill-ts';
+
+import type { MenuItem } from './MenuItem';
+
+/**
+ * Class to handle menu events and delegate to registered menu items.
+ */
+export class MenuManager {
+  private readonly menuItems = new Map<string, MenuItem>();
+
+  // Track shown menu instance ID
+  // https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/menus/onShown
+  private lastMenuInstanceId = 0;
+  private nextMenuInstanceId = 1;
+
+  /**
+   * Register a menu item.
+   */
+  registerMenuItem(id: string, item: MenuItem): void {
+    this.menuItems.set(id, item);
+  }
+
+  /**
+   * Update whether menu items are enabled when the menu is shown.
+   * The menu must have been opened in the 'link' context in the current Treetop
+   * tab.
+   */
+  async handleMenuShown(
+    info: browser.menus._OnShownInfo,
+    tab: browser.tabs.Tab
+  ): Promise<void> {
+    if (!info.contexts.includes('link') || info.viewType !== 'tab') {
+      return;
+    }
+
+    // Get match pattern for the extension's origin
+    // https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/permissions#Host_permissions
+    const origin = browser.runtime.getURL('');
+    if (!info.pageUrl || !info.pageUrl.startsWith(origin)) {
+      return;
+    }
+
+    // Store menu instance ID before calling async function
+    const menuInstanceId = this.nextMenuInstanceId;
+    ++this.nextMenuInstanceId;
+    this.lastMenuInstanceId = menuInstanceId;
+
+    const currentTab = await browser.tabs.getCurrent();
+    if (currentTab.id !== tab.id) {
+      return;
+    }
+
+    // Check whether the same menu is still shown
+    if (menuInstanceId !== this.lastMenuInstanceId) {
+      return;
+    }
+
+    // Get target bookmark
+    if (info.targetElementId) {
+      const elem = browser.menus.getTargetElement(
+        info.targetElementId
+      ) as HTMLElement;
+      const nodeId = elem.dataset.nodeId;
+
+      // Update whether menu items are enabled based on the target
+      if (nodeId) {
+        await this.updateEnabled(nodeId);
+      }
+    }
+  }
+
+  /**
+   * Reset the menu instance ID when the menu is hidden.
+   */
+  handleMenuHidden(): void {
+    this.lastMenuInstanceId = 0;
+  }
+
+  /**
+   * Call a registered menu item handler when a menu item is clicked.
+   * The menu must have been clicked in the current Treetop tab.
+   */
+  async handleMenuClicked(
+    info: browser.menus.OnClickData,
+    tab?: browser.tabs.Tab
+  ): Promise<void> {
+    if (info.viewType !== 'tab' || !tab) {
+      return;
+    }
+
+    const currentTab = await browser.tabs.getCurrent();
+    if (currentTab.id !== tab.id) {
+      return;
+    }
+
+    // Get target bookmark
+    if (info.targetElementId) {
+      const elem = browser.menus.getTargetElement(
+        info.targetElementId
+      ) as HTMLElement;
+      const nodeId = elem.dataset.nodeId;
+
+      if (nodeId && info.menuItemId) {
+        // Call the menu item handler
+        const item = this.menuItems.get(info.menuItemId as string);
+        if (item !== undefined) {
+          item.onClicked(nodeId);
+        }
+      }
+    }
+  }
+
+  /**
+   * Update whether menu items are enabled based on the target node.
+   */
+  async updateEnabled(nodeId: string): Promise<void> {
+    for (const [id, item] of this.menuItems.entries()) {
+      const enabled = item.enabled(nodeId);
+      await browser.menus.update(id, { enabled });
+    }
+
+    await browser.menus.refresh();
+  }
+}
diff --git a/src/treetop/menus/OpenAllInTabsMenuItem.ts b/src/treetop/menus/OpenAllInTabsMenuItem.ts
new file mode 100644
index 0000000..fd63ac2
--- /dev/null
+++ b/src/treetop/menus/OpenAllInTabsMenuItem.ts
@@ -0,0 +1,38 @@
+import { get } from 'svelte/store';
+
+import { BOOKMARKS_ROOT_GUID } from '@Treetop/treetop/constants';
+import type * as Treetop from '@Treetop/treetop/types';
+
+import type { OnClickedCallback } from './MenuItem';
+import { MenuItem } from './MenuItem';
+
+/**
+ * Menu item to open a folder's immediate children in tabs.
+ */
+export class OpenAllInTabsMenuItem extends MenuItem {
+  constructor(
+    private readonly nodeStoreMap: Treetop.NodeStoreMap,
+    onClickedCallback: OnClickedCallback
+  ) {
+    super(onClickedCallback);
+  }
+
+  enabled(nodeId: string): boolean {
+    //
+    // Enable for non-empty folders, excluding the bookmarks root
+    //
+
+    if (nodeId === BOOKMARKS_ROOT_GUID) {
+      return false;
+    }
+
+    const nodeStore = this.nodeStoreMap.get(nodeId);
+    if (nodeStore === undefined) {
+      return false;
+    }
+
+    const node: Treetop.FolderNode = get(nodeStore);
+
+    return node.children.length > 0;
+  }
+}
diff --git a/src/treetop/menus/PropertiesMenuItem.ts b/src/treetop/menus/PropertiesMenuItem.ts
new file mode 100644
index 0000000..8d10962
--- /dev/null
+++ b/src/treetop/menus/PropertiesMenuItem.ts
@@ -0,0 +1,28 @@
+import {
+  BOOKMARKS_MENU_GUID,
+  BOOKMARKS_ROOT_GUID,
+  BOOKMARKS_TOOLBAR_GUID,
+  OTHER_BOOKMARKS_GUID,
+} from '@Treetop/treetop/constants';
+
+import type { OnClickedCallback } from './MenuItem';
+import { MenuItem } from './MenuItem';
+
+/**
+ * Menu item to show the properties dialog for a bookmark or folder.
+ */
+export class PropertiesMenuItem extends MenuItem {
+  constructor(onClickedCallback: OnClickedCallback) {
+    super(onClickedCallback);
+  }
+
+  enabled(nodeId: string): boolean {
+    // Disable modifying special bookmark roots
+    return (
+      nodeId !== BOOKMARKS_ROOT_GUID &&
+      nodeId !== BOOKMARKS_TOOLBAR_GUID &&
+      nodeId !== BOOKMARKS_MENU_GUID &&
+      nodeId !== OTHER_BOOKMARKS_GUID
+    );
+  }
+}
diff --git a/src/treetop/types.ts b/src/treetop/types.ts
new file mode 100644
index 0000000..bb05df3
--- /dev/null
+++ b/src/treetop/types.ts
@@ -0,0 +1,57 @@
+import type { Writable } from 'svelte/store';
+
+// Bookmark node type
+export enum NodeType {
+  Bookmark,
+  Folder,
+  Separator,
+}
+
+interface BaseNode {
+  id: string;
+  parentId?: string;
+}
+
+export interface BookmarkNode extends BaseNode {
+  type: NodeType.Bookmark;
+  title: string;
+  url: string;
+}
+
+export interface FolderNode extends BaseNode {
+  type: NodeType.Folder;
+  title: string;
+  children: Node[];
+}
+
+export interface SeparatorNode extends BaseNode {
+  type: NodeType.Separator;
+}
+
+export type Node = BookmarkNode | FolderNode | SeparatorNode;
+
+// Map from node ID to a store holding a folder node.
+// Provides access to bookmark data.
+export type NodeStoreMap = Map<string, Writable<FolderNode>>;
+
+// Map from node ID to last visit time in milliseconds since the epoch.
+// Provides access to the last visist times of bookmarks.
+export type LastVisitTimeMap = Map<string, Writable<number>>;
+
+// Changes to a bookmark's properties
+export interface PropertiesChanges {
+  title: string;
+  url?: string;
+}
+
+// Preference value in extension storage
+export type PreferenceValue =
+  | string
+  | number
+  | boolean
+  | string[]
+  | number[]
+  | boolean[];
+
+// Function to unsubscribe from a store's value updates
+export type SvelteStoreUnsubscriber = () => void;
diff --git a/src/treetop/utils.ts b/src/treetop/utils.ts
new file mode 100644
index 0000000..b5466ce
--- /dev/null
+++ b/src/treetop/utils.ts
@@ -0,0 +1,18 @@
+/**
+ * Shorten a string greater than the specified length by replacing text in the
+ * middle with an ellipsis. Assumes maxLength is positive.
+ * Based on https://stackoverflow.com/a/831583
+ */
+export function truncateMiddle(str: string, maxLength: number): string {
+  if (str.length <= maxLength) {
+    return str;
+  }
+
+  const midpoint = Math.floor(str.length / 2);
+  const toRemove = str.length - maxLength;
+  const lstrip = Math.floor(toRemove / 2);
+  const rstrip = toRemove - lstrip + 1;
+  const left = str.slice(0, midpoint - lstrip);
+  const right = str.slice(midpoint + rstrip);
+  return `${left}...${right}`;
+}
diff --git a/src/types/custom.d.ts b/src/types/custom.d.ts
new file mode 100644
index 0000000..cd93f58
--- /dev/null
+++ b/src/types/custom.d.ts
@@ -0,0 +1,8 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+
+// Module for SVG files.
+// See https://webpack.js.org/guides/typescript/#importing-other-assets
+declare module '*.svg' {
+  const content: any;
+  export default content;
+}
diff --git a/src/types/smui/index.d.ts b/src/types/smui/index.d.ts
new file mode 100644
index 0000000..a1fdee8
--- /dev/null
+++ b/src/types/smui/index.d.ts
@@ -0,0 +1,107 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+
+declare module '@smui/dialog' {
+  import type { SvelteComponent } from 'svelte';
+
+  class Dialog extends SvelteComponent {
+    $$prop_def: Record<string, unknown>;
+  }
+
+  class Actions extends SvelteComponent {
+    $$prop_def: Record<string, unknown>;
+  }
+  class Content extends SvelteComponent {
+    $$prop_def: {
+      id: string;
+    };
+  }
+  class Title extends SvelteComponent {
+    $$prop_def: {
+      id: string;
+    };
+  }
+
+  let InitialFocus: (
+    node: HTMLElement
+  ) => {
+    destroy: () => void;
+  };
+
+  export default Dialog;
+  export { Actions, Content, InitialFocus, Title };
+}
+
+declare module '@smui/button' {
+  import type { SvelteComponent } from 'svelte';
+
+  class Button extends SvelteComponent {
+    $$prop_def: {
+      use?: any[];
+      action?: string;
+      disabled?: boolean;
+    };
+  }
+
+  class Label extends SvelteComponent {
+    $$prop_def: Record<string, unknown>;
+  }
+
+  export default Button;
+  export { Label };
+}
+
+declare module '@smui/icon-button' {
+  import type { SvelteComponent } from 'svelte';
+
+  class IconButton extends SvelteComponent {
+    $$prop_def: {
+      use?: any[];
+      class?: string;
+    };
+  }
+
+  export default IconButton;
+}
+
+declare module '@smui/linear-progress' {
+  import type { SvelteComponent } from 'svelte';
+
+  class LinearProgress extends SvelteComponent {
+    $$prop_def: {
+      indeterminate?: boolean;
+    };
+  }
+
+  export default LinearProgress;
+}
+
+declare module '@smui/snackbar' {
+  import type { SvelteComponent } from 'svelte';
+
+  class Snackbar extends SvelteComponent {
+    $$prop_def: {
+      leading?: boolean;
+      labelText?: string | null;
+    };
+  }
+  class Label extends SvelteComponent {
+    $$prop_def: Record<string, unknown>;
+  }
+
+  export default Snackbar;
+  export { Label };
+}
+
+declare module '@smui/textfield' {
+  import type { SvelteComponent } from 'svelte';
+
+  class TextField extends SvelteComponent {
+    $$prop_def: {
+      label?: string;
+      value?: string;
+      style?: string;
+    };
+  }
+
+  export default TextField;
+}
diff --git a/src/welcome/InfoBox.svelte b/src/welcome/InfoBox.svelte
new file mode 100644
index 0000000..973886d
--- /dev/null
+++ b/src/welcome/InfoBox.svelte
@@ -0,0 +1,41 @@
+<style>
+  .container {
+    margin: 3rem;
+  }
+
+  .title {
+    font-weight: 500;
+    padding: 1rem 0;
+    color: #76aa6a;
+  }
+
+  .detail {
+    font-size: 2rem;
+    padding: 1rem 0;
+  }
+
+  .content {
+    background-color: #f4f4f4;
+    max-width: 100rem;
+    margin: 0 auto;
+    padding: 0.5em 1em;
+    border-radius: 0.25em;
+    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
+  }
+</style>
+
+<div class="container">
+  <div class="content">
+    <div class="title">
+      <slot name="title" />
+    </div>
+    <div class="detail">
+      <slot name="detail1" />
+    </div>
+    {#if $$slots.detail2}
+      <div class="detail">
+        <slot name="detail2" />
+      </div>
+    {/if}
+  </div>
+</div>
diff --git a/src/welcome/Welcome.svelte b/src/welcome/Welcome.svelte
new file mode 100644
index 0000000..3075068
--- /dev/null
+++ b/src/welcome/Welcome.svelte
@@ -0,0 +1,108 @@
+<script lang="ts">
+  import icon from '../icons/generated/icon.svg';
+
+  import InfoBox from './InfoBox.svelte';
+</script>
+
+<style>
+  :global(body) {
+    background-color: #fefefa;
+    font-family: 'Open Sans', -apple-system, 'Segoe UI', 'Roboto', sans-serif;
+    font-size: 3rem;
+    font-weight: 400;
+    margin: 0;
+  }
+
+  header {
+    background-color: #676778;
+    color: white;
+    padding: 20px 0px;
+  }
+
+  footer {
+    background-color: #676778;
+    height: 3rem;
+    padding: 20px 0px;
+  }
+
+  main {
+    margin: 3rem 0;
+  }
+
+  .logo {
+    position: relative;
+    top: 1rem;
+  }
+
+  .icon {
+    height: 1.5rem;
+    position: relative;
+    top: 0.2rem;
+  }
+
+  .title {
+    max-width: 100rem;
+    margin: 0 auto;
+    display: flex;
+    flex-direction: column;
+  }
+
+  .subtitle {
+    color: lightgray;
+    font-size: smaller;
+    font-style: italic;
+    margin-top: 30px;
+  }
+</style>
+
+<div>
+  <header>
+    <div class="title">
+      <div>
+        <img class="logo" src={icon} alt="Treetop Logo" />
+        Thanks for installing Treetop!
+      </div>
+      <div class="subtitle">
+        Treetop is a high-level live view of your bookmarks.
+      </div>
+    </div>
+  </header>
+
+  <main>
+    <InfoBox>
+      <span slot="title">Getting started</span>
+      <span slot="detail1">
+        Open Treetop by clicking its icon (<img
+          class="icon"
+          src={icon}
+          alt="Treetop Icon" />) in the toolbar.
+      </span>
+      <span slot="detail2">Treetop shows all your bookmarks on a single page.</span>
+    </InfoBox>
+
+    <InfoBox>
+      <span slot="title">Always up-to-date</span>
+      <span slot="detail1"> Treetop updates automatically as you browse.</span>
+      <span slot="detail2">
+        Recently visited bookmarks have a larger font.
+      </span>
+    </InfoBox>
+
+    <InfoBox>
+      <span slot="title">Edit your bookmarks</span>
+      <span slot="detail1">
+        Right-click to edit or delete bookmarks and folders.
+      </span>
+    </InfoBox>
+
+    <InfoBox>
+      <span slot="title">Customize</span>
+      <span slot="detail1">
+        Click the Preferences button to customize Treetop's display.
+      </span>
+      <span slot="detail2">Click a folder to set Treetop's root.</span>
+    </InfoBox>
+  </main>
+
+  <footer />
+</div>
diff --git a/src/welcome/main.ts b/src/welcome/main.ts
new file mode 100644
index 0000000..cbc54c9
--- /dev/null
+++ b/src/welcome/main.ts
@@ -0,0 +1,8 @@
+// eslint-disable-next-line simple-import-sort/sort
+import 'normalize.css/normalize.css';
+
+import Welcome from './Welcome.svelte';
+
+new Welcome({
+  target: document.body,
+});
diff --git a/svelte.config.js b/svelte.config.js
new file mode 100644
index 0000000..2dd3664
--- /dev/null
+++ b/svelte.config.js
@@ -0,0 +1,5 @@
+const sveltePreprocess = require('svelte-preprocess');
+
+module.exports = {
+  preprocess: sveltePreprocess(),
+};
diff --git a/test/background_script/init.test.ts b/test/background_script/init.test.ts
new file mode 100644
index 0000000..01c878e
--- /dev/null
+++ b/test/background_script/init.test.ts
@@ -0,0 +1,19 @@
+import { init } from '@Treetop/background_script/init';
+import { createContextMenus } from '@Treetop/background_script/menus';
+import { openTreetop, openWelcome } from '@Treetop/background_script/open';
+import { setDefaultOptions } from '@Treetop/background_script/options';
+
+jest
+  .mock('@Treetop/background_script/menus')
+  .mock('@Treetop/background_script/open')
+  .mock('@Treetop/background_script/options');
+
+it('initializes extension', async () => {
+  mockBrowser.runtime.onInstalled.addListener.expect(openWelcome);
+  mockBrowser.browserAction.onClicked.addListener.expect(openTreetop);
+
+  await init();
+
+  expect(setDefaultOptions).toHaveBeenCalledTimes(1);
+  expect(createContextMenus).toHaveBeenCalledTimes(1);
+});
diff --git a/test/background_script/menus.test.ts b/test/background_script/menus.test.ts
new file mode 100644
index 0000000..33ad8b6
--- /dev/null
+++ b/test/background_script/menus.test.ts
@@ -0,0 +1,12 @@
+import { createContextMenus } from '@Treetop/background_script/menus';
+
+const NUM_ACTIONS = 3;
+const NUM_SEPARATORS = 2;
+
+it('creates context menus', () => {
+  mockBrowser.runtime.getURL.expect('');
+  mockBrowser.i18n.getMessage.expect.times(NUM_ACTIONS);
+  mockBrowser.menus.create.expect.times(NUM_ACTIONS + NUM_SEPARATORS);
+
+  createContextMenus();
+});
diff --git a/test/background_script/open.test.ts b/test/background_script/open.test.ts
new file mode 100644
index 0000000..b82550e
--- /dev/null
+++ b/test/background_script/open.test.ts
@@ -0,0 +1,96 @@
+import faker from 'faker';
+
+import { openTreetop } from '@Treetop/background_script/open';
+
+let tab: browser.tabs.Tab;
+let info: browser.browserAction.OnClickData;
+let url: string;
+
+beforeEach(() => {
+  tab = {
+    index: 0,
+    highlighted: false,
+    active: false,
+    pinned: false,
+    incognito: false,
+  };
+
+  info = {
+    modifiers: [],
+    button: 0,
+  };
+
+  url = faker.internet.url();
+
+  mockBrowser.runtime.getURL.expect('treetop.html').andReturn(url);
+});
+
+describe('left click', () => {
+  beforeEach(() => {
+    info.button = 0;
+  });
+
+  it('opens in current tab', () => {
+    mockBrowser.tabs.update.expect({ url });
+
+    openTreetop(tab, info);
+  });
+
+  it('opens in new tab with Ctrl', () => {
+    info.modifiers.push('Ctrl');
+
+    mockBrowser.tabs.create.expect({
+      active: false,
+      url,
+    });
+
+    openTreetop(tab, info);
+  });
+
+  it('opens in new active tab with Ctrl+Shift', () => {
+    info.modifiers.push('Ctrl', 'Shift');
+
+    mockBrowser.tabs.create.expect({
+      active: true,
+      url,
+    });
+
+    openTreetop(tab, info);
+  });
+
+  it('opens in new window with Shift', () => {
+    info.modifiers.push('Shift');
+
+    mockBrowser.windows.create.expect({
+      url,
+    });
+
+    openTreetop(tab, info);
+  });
+});
+
+describe('middle click', () => {
+  beforeEach(() => {
+    info.button = 1;
+  });
+
+  it('opens in new tab', () => {
+    mockBrowser.tabs.create.expect({
+      active: false,
+      url,
+    });
+
+    openTreetop(tab, info);
+  });
+
+  it('opens in new active tab with Shift', () => {
+    info.modifiers.push('Shift');
+
+    mockBrowser.tabs.create.expect({
+      active: true,
+      url,
+    });
+
+    openTreetop(tab, info);
+  });
+});
diff --git a/test/background_script/options.test.ts b/test/background_script/options.test.ts
new file mode 100644
index 0000000..f19ca62
--- /dev/null
+++ b/test/background_script/options.test.ts
@@ -0,0 +1,7 @@
+import { setDefaultOptions } from '@Treetop/background_script/options';
+
+it('sets default options', async () => {
+  mockBrowser.storage.local.set.expect;
+
+  await setDefaultOptions();
+});
diff --git a/test/options/Options.svelte.test.ts b/test/options/Options.svelte.test.ts
new file mode 100644
index 0000000..e08a62e
--- /dev/null
+++ b/test/options/Options.svelte.test.ts
@@ -0,0 +1,113 @@
+import { fireEvent, render, screen, waitFor } from '@testing-library/svelte';
+
+import Options from '@Treetop/options/Options.svelte';
+
+import ContextWrapper from '../utils/ContextWrapper.svelte';
+
+const setup = () => {
+  render(ContextWrapper, {
+    Component: Options,
+    Props: {},
+    Context: {},
+  });
+};
+
+describe('Options', () => {
+  beforeEach(() => {
+    mockBrowser.i18n.getMessage
+      .expect('optionHeadingGeneral')
+      .andReturn('general');
+    mockBrowser.i18n.getMessage
+      .expect('optionHeadingBookmarks')
+      .andReturn('bookmarks');
+    mockBrowser.i18n.getMessage
+      .expect('optionShowBookmarksToolbar')
+      .andReturn('show bookmarks toolbar');
+    mockBrowser.i18n.getMessage
+      .expect('optionShowBookmarksMenu')
+      .andReturn('show bookmarks menu');
+    mockBrowser.i18n.getMessage
+      .expect('optionShowOtherBookmarks')
+      .andReturn('show other bookmarks');
+    mockBrowser.i18n.getMessage
+      .expect('optionTruncateLongTitles')
+      .andReturn('truncate');
+    mockBrowser.i18n.getMessage
+      .expect('optionDisplayTooltips')
+      .andReturn('tooltips');
+    mockBrowser.i18n.getMessage
+      .expect('optionShowRecentlyVisited')
+      .andReturn('show recently visited');
+
+    mockBrowser.storage.local.get.expect.andResolve({
+      showBookmarksToolbar: true,
+      showBookmarksMenu: false,
+      showOtherBookmarks: true,
+      truncate: false,
+      tooltips: true,
+      showRecentlyVisited: true,
+    });
+  });
+
+  it('renders', async () => {
+    setup();
+
+    await waitFor(() => {
+      expect(screen.getByText(/^general/i)).toBeInTheDocument();
+      expect(screen.getByText(/^bookmarks/i)).toBeInTheDocument();
+      expect(
+        screen.getByLabelText(/^show bookmarks toolbar/i)
+      ).toBeInTheDocument();
+      expect(
+        screen.getByLabelText(/^show bookmarks menu/i)
+      ).toBeInTheDocument();
+      expect(
+        screen.getByLabelText(/^show other bookmarks/i)
+      ).toBeInTheDocument();
+      expect(screen.getByLabelText(/^truncate/i)).toBeInTheDocument();
+      expect(screen.getByLabelText(/^tooltips/i)).toBeInTheDocument();
+      expect(
+        screen.getByLabelText(/^show recently visited/i)
+      ).toBeInTheDocument();
+    });
+  });
+
+  it('initializes preferences from storage', async () => {
+    setup();
+
+    await waitFor(() => {
+      expect(screen.getByText(/^general/i)).toBeInTheDocument();
+    });
+
+    expect(screen.getByLabelText(/^show bookmarks toolbar/i)).toBeChecked();
+    expect(screen.getByLabelText(/^show bookmarks menu/i)).not.toBeChecked();
+    expect(screen.getByLabelText(/^show other bookmarks/i)).toBeChecked();
+    expect(screen.getByLabelText(/^truncate/i)).not.toBeChecked();
+    expect(screen.getByLabelText(/^tooltips/i)).toBeChecked();
+    expect(screen.getByLabelText(/^show recently visited/i)).toBeChecked();
+  });
+
+  it('updates storage when preference changes', async () => {
+    setup();
+
+    await waitFor(() => {
+      expect(screen.getByLabelText(/^truncate/i)).not.toBeChecked();
+    });
+
+    const truncate = screen.getByLabelText(/^truncate/i);
+
+    // Enable truncate
+    mockBrowser.storage.local.set.expect({ truncate: true });
+    await fireEvent.click(truncate);
+    await waitFor(() => {
+      expect(screen.getByLabelText(/^truncate/i)).toBeChecked();
+    });
+
+    // Disable truncate
+    mockBrowser.storage.local.set.expect({ truncate: false });
+    await fireEvent.click(truncate);
+    await waitFor(() => {
+      expect(screen.getByLabelText(/^truncate/i)).not.toBeChecked();
+    });
+  });
+});
diff --git a/test/treetop/Bookmark.svelte.test.ts b/test/treetop/Bookmark.svelte.test.ts
new file mode 100644
index 0000000..a284f62
--- /dev/null
+++ b/test/treetop/Bookmark.svelte.test.ts
@@ -0,0 +1,204 @@
+import { Writable, writable } from 'svelte/store';
+import { render, screen } from '@testing-library/svelte';
+import faker from 'faker';
+
+import Bookmark from '@Treetop/treetop/Bookmark.svelte';
+import { MILLISECONDS_PER_HOUR } from '@Treetop/treetop/clock';
+import type * as Treetop from '@Treetop/treetop/types';
+
+import ContextWrapper from '../utils/ContextWrapper.svelte';
+
+let lastVisitTimeMap: Treetop.LastVisitTimeMap;
+let truncate: Writable<boolean>;
+let tooltips: Writable<boolean>;
+let nodeId: string;
+let title: string;
+let url: string;
+
+// Maximum allowed length of titles and URLs before being truncated, sometimes
+const maxLength = 78;
+
+const setup = () => {
+  render(ContextWrapper, {
+    Component: Bookmark,
+    Props: { nodeId, title, url },
+    Context: {
+      lastVisitTimeMap,
+      truncate,
+      tooltips,
+    },
+  });
+};
+
+beforeEach(() => {
+  nodeId = faker.random.uuid();
+  title = faker.random.words();
+  url = faker.internet.url();
+
+  lastVisitTimeMap = new Map() as Treetop.LastVisitTimeMap;
+  lastVisitTimeMap.set(nodeId, writable(0));
+
+  truncate = writable(false);
+  tooltips = writable(false);
+});
+
+it('renders link with expected attributes', () => {
+  setup();
+
+  const link = screen.getByRole('link');
+  expect(link).toHaveTextContent(title);
+  expect(link).toHaveAttribute('href', url);
+  expect(link).toHaveAttribute('data-node-id', nodeId);
+  expect(link).not.toHaveAttribute('title');
+  expect(link).not.toHaveClass(
+    'visitedPastDay',
+    'visitedPastTwoDays',
+    'visitedPastThreeDays',
+    'visitedPastWeek'
+  );
+});
+
+it('uses URL as content when title is empty', () => {
+  title = '';
+
+  setup();
+
+  const link = screen.getByRole('link');
+  expect(link).toHaveTextContent(url);
+});
+
+describe('truncate option', () => {
+  beforeEach(() => {
+    truncate.set(true);
+  });
+
+  it('truncates long title', () => {
+    title = faker.random.alphaNumeric(maxLength + 1);
+    expect(title.length).toBeGreaterThan(maxLength);
+
+    setup();
+
+    const link = screen.getByRole('link');
+    expect(link).toHaveTextContent(
+      new RegExp(`^${title.substring(0, title.length - 4)}.{3}$`)
+    );
+  });
+
+  it('truncates long title at a space when possible', () => {
+    title = faker.random.words(15);
+    expect(title.length).toBeGreaterThan(maxLength);
+
+    setup();
+
+    const link = screen.getByRole('link');
+    const titleStart = title.substring(0, Math.floor(maxLength / 2));
+    expect(link).toHaveTextContent(new RegExp(`^${titleStart}.+\\S\\.{3}$`));
+  });
+
+  it('truncates URL when title is empty', () => {
+    title = '';
+    url += `/${faker.random.alphaNumeric(maxLength)}`;
+    expect(url.length).toBeGreaterThan(maxLength);
+
+    setup();
+
+    const link = screen.getByRole('link');
+    const urlStart = url.substring(0, Math.floor(maxLength / 2));
+    expect(link).toHaveTextContent(new RegExp(`^${urlStart}.+\\S.{3}$`));
+  });
+
+  it("doesn't truncate short title", () => {
+    title = faker.random.alphaNumeric(Math.floor(maxLength / 2));
+
+    setup();
+
+    const link = screen.getByRole('link');
+    expect(link).toHaveTextContent(title);
+  });
+});
+
+describe('tooltips option', () => {
+  beforeEach(() => {
+    tooltips.set(true);
+  });
+
+  it('title attribute contains title and URL', () => {
+    setup();
+
+    const link = screen.getByRole('link');
+    expect(link).toHaveAttribute(
+      'title',
+      expect.stringMatching(`^${title}\n${url}$`)
+    );
+  });
+
+  it('long URL is truncated in the middle', () => {
+    url += `/${faker.random.alphaNumeric(maxLength)}`;
+
+    setup();
+
+    const link = screen.getByRole('link');
+    expect(link).toHaveAttribute(
+      'title',
+      expect.stringMatching(
+        `^${title}\n${url.substring(0, 20)}.+\\.{3}.+${url.substring(
+          url.length - 10
+        )}$`
+      )
+    );
+  });
+});
+
+describe('sets class based on last visit time', () => {
+  it.each`
+    deltaHours        | className
+    ${0}              | ${'visitedPastDay'}
+    ${1}              | ${'visitedPastDay'}
+    ${4}              | ${'visitedPastDay'}
+    ${12}             | ${'visitedPastDay'}
+    ${20}             | ${'visitedPastDay'}
+    ${24 - 0.001}     | ${'visitedPastDay'}
+    ${24 + 0.001}     | ${'visitedPastTwoDays'}
+    ${24 + 1}         | ${'visitedPastTwoDays'}
+    ${2 * 24 - 0.001} | ${'visitedPastTwoDays'}
+    ${2 * 24 + 0.001} | ${'visitedPastThreeDays'}
+    ${3 * 24 - 0.001} | ${'visitedPastThreeDays'}
+    ${3 * 24 + 0.001} | ${'visitedPastWeek'}
+    ${4 * 24}         | ${'visitedPastWeek'}
+    ${5 * 24}         | ${'visitedPastWeek'}
+    ${6 * 24}         | ${'visitedPastWeek'}
+    ${7 * 24 - 0.001} | ${'visitedPastWeek'}
+  `(
+    'visited $deltaHours hours ago -> $className',
+    ({ deltaHours, className }) => {
+      const deltaMs = deltaHours * MILLISECONDS_PER_HOUR;
+      const lastVisitTime = Date.now() - deltaMs;
+      lastVisitTimeMap.get(nodeId)!.set(lastVisitTime);
+
+      setup();
+
+      const link = screen.getByRole('link');
+      expect(link).toHaveClass(className);
+    }
+  );
+
+  it.each`
+    deltaHours
+    ${7 * 24 + 0.001}
+    ${8 * 24}
+  `('visited $deltaHours ago -> no class', ({ deltaHours }) => {
+    const deltaMs = deltaHours * MILLISECONDS_PER_HOUR;
+    const lastVisitTime = Date.now() - deltaMs;
+    lastVisitTimeMap.get(nodeId)!.set(lastVisitTime);
+
+    setup();
+
+    const link = screen.getByRole('link');
+    expect(link).not.toHaveClass(
+      'visitedPastDay',
+      'visitedPastTwoDays',
+      'visitedPastThreeDays',
+      'visitedPastWeek'
+    );
+  });
+});
diff --git a/test/treetop/BookmarksManager.test.ts b/test/treetop/BookmarksManager.test.ts
new file mode 100644
index 0000000..cf38eaa
--- /dev/null
+++ b/test/treetop/BookmarksManager.test.ts
@@ -0,0 +1,938 @@
+/* eslint no-irregular-whitespace: ["error", { "skipComments": true }] */
+
+import { get, Writable } from 'svelte/store';
+import faker from 'faker';
+
+import { BookmarksManager } from '@Treetop/treetop/BookmarksManager';
+import {
+  BOOKMARKS_MENU_GUID,
+  BOOKMARKS_ROOT_GUID,
+  BOOKMARKS_TOOLBAR_GUID,
+  MOBILE_BOOKMARKS_GUID,
+  OTHER_BOOKMARKS_GUID,
+} from '@Treetop/treetop/constants';
+import * as Treetop from '@Treetop/treetop/types';
+
+import {
+  createBrowserBookmarkNode,
+  createBrowserBookmarksTree,
+  createBrowserFolderNode,
+  createBrowserSeparatorNode,
+} from '../utils/factories';
+
+const getFolderNode = (
+  store: Writable<Treetop.FolderNode> | undefined
+): Treetop.FolderNode => {
+  if (store === undefined) {
+    throw new TypeError();
+  }
+
+  return get(store);
+};
+
+let nodeStoreMap: Treetop.NodeStoreMap;
+let bookmarksManager: BookmarksManager;
+let bookmarksTree: browser.bookmarks.BookmarkTreeNode[];
+let bookmarksRoot: browser.bookmarks.BookmarkTreeNode;
+
+const NUM_BOOKMARK_ROOTS = 4;
+
+beforeEach(() => {
+  nodeStoreMap = new Map() as Treetop.NodeStoreMap;
+  bookmarksTree = createBrowserBookmarksTree();
+  bookmarksRoot = bookmarksTree[0];
+  bookmarksManager = new BookmarksManager(nodeStoreMap);
+});
+
+describe('loadBookmarks', () => {
+  it('creates nodes for built-in bookmark roots', async () => {
+    mockBrowser.bookmarks.getTree.expect.andResolve(bookmarksTree);
+
+    await bookmarksManager.loadBookmarks();
+
+    expect(nodeStoreMap.size).toBe(NUM_BOOKMARK_ROOTS);
+
+    expect(nodeStoreMap.get(BOOKMARKS_ROOT_GUID)).toBeDefined();
+    expect(get(nodeStoreMap.get(BOOKMARKS_ROOT_GUID)!)).toMatchObject({
+      id: BOOKMARKS_ROOT_GUID,
+      type: Treetop.NodeType.Folder,
+      title: '',
+    });
+
+    expect(nodeStoreMap.get(BOOKMARKS_MENU_GUID)).toBeDefined();
+    expect(get(nodeStoreMap.get(BOOKMARKS_MENU_GUID)!)).toMatchObject({
+      id: BOOKMARKS_MENU_GUID,
+      type: Treetop.NodeType.Folder,
+      title: 'Bookmarks Menu',
+    });
+
+    expect(nodeStoreMap.get(BOOKMARKS_TOOLBAR_GUID)).toBeDefined();
+    expect(get(nodeStoreMap.get(BOOKMARKS_TOOLBAR_GUID)!)).toMatchObject({
+      id: BOOKMARKS_TOOLBAR_GUID,
+      type: Treetop.NodeType.Folder,
+      title: 'Bookmarks Toolbar',
+    });
+
+    expect(nodeStoreMap.get(OTHER_BOOKMARKS_GUID)).toBeDefined();
+    expect(get(nodeStoreMap.get(OTHER_BOOKMARKS_GUID)!)).toMatchObject({
+      id: OTHER_BOOKMARKS_GUID,
+      type: Treetop.NodeType.Folder,
+      title: 'Other Bookmarks',
+    });
+
+    expect(nodeStoreMap.has(MOBILE_BOOKMARKS_GUID)).toBe(false);
+  });
+
+  it('creates nodes for folders', async () => {
+    // Create one or more folders under each root
+    const folders = [0, 1, 1, 2, 2, 2].map((index) => {
+      return createBrowserFolderNode(bookmarksRoot.children![index]);
+    });
+
+    mockBrowser.bookmarks.getTree.expect.andResolve(bookmarksTree);
+
+    await bookmarksManager.loadBookmarks();
+
+    expect(nodeStoreMap.size).toBe(NUM_BOOKMARK_ROOTS + folders.length);
+
+    for (const folder of folders) {
+      expect(nodeStoreMap.get(folder.id)).toBeDefined();
+      expect(get(nodeStoreMap.get(folder.id)!)).toMatchObject({
+        id: folder.id,
+        type: Treetop.NodeType.Folder,
+        title: folder.title,
+        children: [],
+      });
+    }
+  });
+
+  it('creates nodes for nested folders', async () => {
+    // Create a folder and two folders within it
+    const parentFolder = createBrowserFolderNode(bookmarksRoot.children![0]);
+    const childFolder1 = createBrowserFolderNode(parentFolder);
+    const childFolder2 = createBrowserFolderNode(parentFolder);
+
+    mockBrowser.bookmarks.getTree.expect.andResolve(bookmarksTree);
+
+    await bookmarksManager.loadBookmarks();
+
+    expect(nodeStoreMap.size).toBe(NUM_BOOKMARK_ROOTS + 3);
+
+    expect(nodeStoreMap.get(parentFolder.id)).toBeDefined();
+    expect(get(nodeStoreMap.get(parentFolder.id)!)).toMatchObject({
+      id: parentFolder.id,
+      type: Treetop.NodeType.Folder,
+      title: parentFolder.title,
+      children: [
+        {
+          id: childFolder1.id,
+          type: Treetop.NodeType.Folder,
+          title: childFolder1.title,
+        },
+        {
+          id: childFolder2.id,
+          type: Treetop.NodeType.Folder,
+          title: childFolder2.title,
+        },
+      ],
+    });
+
+    expect(nodeStoreMap.get(childFolder1.id)).toBeDefined();
+    expect(get(nodeStoreMap.get(childFolder1.id)!)).toMatchObject({
+      id: childFolder1.id,
+      type: Treetop.NodeType.Folder,
+      title: childFolder1.title,
+      children: [],
+    });
+
+    expect(nodeStoreMap.get(childFolder2.id)).toBeDefined();
+    expect(get(nodeStoreMap.get(childFolder2.id)!)).toMatchObject({
+      id: childFolder2.id,
+      type: Treetop.NodeType.Folder,
+      title: childFolder2.title,
+      children: [],
+    });
+  });
+
+  it("includes bookmarks in folder's children", async () => {
+    // Create a folder and bookmarks within it
+    const folder = createBrowserFolderNode(bookmarksRoot.children![0]);
+    const bookmarks = [];
+    for (let i = 0; i < 3; i++) {
+      bookmarks.push(createBrowserBookmarkNode(folder));
+    }
+
+    mockBrowser.bookmarks.getTree.expect.andResolve(bookmarksTree);
+
+    await bookmarksManager.loadBookmarks();
+
+    expect(nodeStoreMap.size).toBe(NUM_BOOKMARK_ROOTS + 1);
+
+    expect(nodeStoreMap.get(folder.id)).toBeDefined();
+    expect(get(nodeStoreMap.get(folder.id)!)).toMatchObject({
+      id: folder.id,
+      type: Treetop.NodeType.Folder,
+      title: folder.title,
+      children: [
+        {
+          id: bookmarks[0].id,
+          type: Treetop.NodeType.Bookmark,
+          title: bookmarks[0].title,
+          url: bookmarks[0].url,
+        },
+        {
+          id: bookmarks[1].id,
+          type: Treetop.NodeType.Bookmark,
+          title: bookmarks[1].title,
+          url: bookmarks[1].url,
+        },
+        {
+          id: bookmarks[2].id,
+          type: Treetop.NodeType.Bookmark,
+          title: bookmarks[2].title,
+          url: bookmarks[2].url,
+        },
+      ],
+    });
+  });
+
+  it("includes separators in folder's children", async () => {
+    // Create a folder and a separators within it
+    const folder = createBrowserFolderNode(bookmarksRoot.children![0]);
+    const separator = createBrowserSeparatorNode(folder);
+
+    mockBrowser.bookmarks.getTree.expect.andResolve(bookmarksTree);
+
+    await bookmarksManager.loadBookmarks();
+
+    expect(nodeStoreMap.size).toBe(NUM_BOOKMARK_ROOTS + 1);
+
+    expect(nodeStoreMap.get(folder.id)).toBeDefined();
+    expect(get(nodeStoreMap.get(folder.id)!)).toMatchObject({
+      id: folder.id,
+      type: Treetop.NodeType.Folder,
+      title: folder.title,
+      children: [
+        {
+          id: separator.id,
+          type: Treetop.NodeType.Separator,
+        },
+      ],
+    });
+  });
+
+  it("reorders root boookmark node's children", async () => {
+    mockBrowser.bookmarks.getTree.expect.andResolve(bookmarksTree);
+
+    expect(bookmarksManager.showBookmarksToolbar).toBe(true);
+    expect(bookmarksManager.showBookmarksMenu).toBe(true);
+    expect(bookmarksManager.showOtherBookmarks).toBe(true);
+
+    await bookmarksManager.loadBookmarks();
+
+    expect(nodeStoreMap.size).toBe(NUM_BOOKMARK_ROOTS);
+    expect(nodeStoreMap.get(BOOKMARKS_ROOT_GUID)).toBeDefined();
+    expect(get(nodeStoreMap.get(BOOKMARKS_ROOT_GUID)!)).toMatchObject({
+      id: BOOKMARKS_ROOT_GUID,
+      type: Treetop.NodeType.Folder,
+      title: '',
+      children: [
+        {
+          id: BOOKMARKS_TOOLBAR_GUID,
+          type: Treetop.NodeType.Folder,
+          title: 'Bookmarks Toolbar',
+        },
+        {
+          id: BOOKMARKS_MENU_GUID,
+          type: Treetop.NodeType.Folder,
+          title: 'Bookmarks Menu',
+        },
+        {
+          id: OTHER_BOOKMARKS_GUID,
+          type: Treetop.NodeType.Folder,
+          title: 'Other Bookmarks',
+        },
+      ],
+    });
+  });
+
+  describe('respects options', () => {
+    beforeEach(() => {
+      mockBrowser.bookmarks.getTree.expect.andResolve(bookmarksTree);
+    });
+
+    it('showBookmarksToolbar', async () => {
+      bookmarksManager.showBookmarksToolbar = false;
+
+      await bookmarksManager.loadBookmarks();
+
+      expect(nodeStoreMap.size).toBe(NUM_BOOKMARK_ROOTS - 1);
+      expect(nodeStoreMap.get(BOOKMARKS_ROOT_GUID)).toBeDefined();
+      expect(get(nodeStoreMap.get(BOOKMARKS_ROOT_GUID)!)).toMatchObject({
+        id: BOOKMARKS_ROOT_GUID,
+        type: Treetop.NodeType.Folder,
+        title: '',
+        children: [
+          {
+            id: BOOKMARKS_MENU_GUID,
+            type: Treetop.NodeType.Folder,
+            title: 'Bookmarks Menu',
+          },
+          {
+            id: OTHER_BOOKMARKS_GUID,
+            type: Treetop.NodeType.Folder,
+            title: 'Other Bookmarks',
+          },
+        ],
+      });
+    });
+
+    it('showBookmarksMenu', async () => {
+      bookmarksManager.showBookmarksMenu = false;
+
+      await bookmarksManager.loadBookmarks();
+
+      expect(nodeStoreMap.size).toBe(NUM_BOOKMARK_ROOTS - 1);
+      expect(nodeStoreMap.get(BOOKMARKS_ROOT_GUID)).toBeDefined();
+      expect(get(nodeStoreMap.get(BOOKMARKS_ROOT_GUID)!)).toMatchObject({
+        id: BOOKMARKS_ROOT_GUID,
+        type: Treetop.NodeType.Folder,
+        title: '',
+        children: [
+          {
+            id: BOOKMARKS_TOOLBAR_GUID,
+            type: Treetop.NodeType.Folder,
+            title: 'Bookmarks Toolbar',
+          },
+          {
+            id: OTHER_BOOKMARKS_GUID,
+            type: Treetop.NodeType.Folder,
+            title: 'Other Bookmarks',
+          },
+        ],
+      });
+    });
+
+    it('showOtherBookmarks', async () => {
+      bookmarksManager.showOtherBookmarks = false;
+
+      await bookmarksManager.loadBookmarks();
+
+      expect(nodeStoreMap.size).toBe(NUM_BOOKMARK_ROOTS - 1);
+      expect(nodeStoreMap.get(BOOKMARKS_ROOT_GUID)).toBeDefined();
+      expect(get(nodeStoreMap.get(BOOKMARKS_ROOT_GUID)!)).toMatchObject({
+        id: BOOKMARKS_ROOT_GUID,
+        type: Treetop.NodeType.Folder,
+        title: '',
+        children: [
+          {
+            id: BOOKMARKS_TOOLBAR_GUID,
+            type: Treetop.NodeType.Folder,
+            title: 'Bookmarks Toolbar',
+          },
+          {
+            id: BOOKMARKS_MENU_GUID,
+            type: Treetop.NodeType.Folder,
+            title: 'Bookmarks Menu',
+          },
+        ],
+      });
+    });
+  });
+});
+
+describe('handleBookmarkCreated', () => {
+  let folderNode: browser.bookmarks.BookmarkTreeNode;
+
+  beforeEach(async () => {
+    // Create bookmarks tree:
+    // base
+    //   ├── bookmarkNode
+    //   └─── folderNode
+    //       └── bookmarkNode
+    const baseNode = bookmarksRoot.children![0];
+    createBrowserBookmarkNode(baseNode);
+    folderNode = createBrowserFolderNode(baseNode);
+    createBrowserBookmarkNode(folderNode);
+    mockBrowser.bookmarks.getTree.expect.andResolve(bookmarksTree);
+    await bookmarksManager.loadBookmarks();
+    expect(nodeStoreMap.size).toBe(NUM_BOOKMARK_ROOTS + 1);
+    expect(nodeStoreMap.get(baseNode.id)).toBeDefined();
+    expect(getFolderNode(nodeStoreMap.get(baseNode.id)).children.length).toBe(
+      2
+    );
+    expect(nodeStoreMap.get(folderNode.id)).toBeDefined();
+    expect(getFolderNode(nodeStoreMap.get(folderNode.id)).children.length).toBe(
+      1
+    );
+  });
+
+  it('created bookmark', async () => {
+    // Create a new bookmark node
+    const node = createBrowserBookmarkNode(folderNode);
+    const children = folderNode.children!;
+    delete folderNode.children;
+    mockBrowser.bookmarks.get.expect(folderNode.id).andResolve([folderNode]);
+    mockBrowser.bookmarks.getChildren
+      .expect(folderNode.id)
+      .andResolve(children);
+
+    // Call bookmark created handler
+    await bookmarksManager.handleBookmarkCreated(node.id, node);
+
+    // New node store is not created for a bookmark
+    expect(nodeStoreMap.size).toBe(NUM_BOOKMARK_ROOTS + 1);
+
+    // New bookmark node appears in parent node's children
+    expect(getFolderNode(nodeStoreMap.get(folderNode.id)).children.length).toBe(
+      2
+    );
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode.id)).children
+    ).toContainEqual({
+      id: node.id,
+      type: Treetop.NodeType.Bookmark,
+      title: node.title,
+      url: node.url,
+    });
+  });
+
+  it('created separator', async () => {
+    // Create a new separator node
+    const node = createBrowserSeparatorNode(folderNode);
+    const children = folderNode.children!;
+    delete folderNode.children;
+    mockBrowser.bookmarks.get.expect(folderNode.id).andResolve([folderNode]);
+    mockBrowser.bookmarks.getChildren
+      .expect(folderNode.id)
+      .andResolve(children);
+
+    // Call bookmark created handler
+    await bookmarksManager.handleBookmarkCreated(node.id, node);
+
+    // New node store is not created for a separator
+    expect(nodeStoreMap.size).toBe(NUM_BOOKMARK_ROOTS + 1);
+
+    // New separator node appears in parent node's children
+    expect(getFolderNode(nodeStoreMap.get(folderNode.id)).children.length).toBe(
+      2
+    );
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode.id)).children
+    ).toContainEqual({
+      id: node.id,
+      type: Treetop.NodeType.Separator,
+    });
+  });
+
+  it('created folder', async () => {
+    // Create a new folder node
+    const node = createBrowserFolderNode(folderNode);
+
+    let children = node.children!;
+    delete node.children;
+    mockBrowser.bookmarks.get.expect(node.id).andResolve([node]);
+    mockBrowser.bookmarks.getChildren.expect(node.id).andResolve(children);
+
+    children = folderNode.children!;
+    delete folderNode.children;
+    mockBrowser.bookmarks.get.expect(folderNode.id).andResolve([folderNode]);
+    mockBrowser.bookmarks.getChildren
+      .expect(folderNode.id)
+      .andResolve(children);
+
+    // Call bookmark created handler
+    await bookmarksManager.handleBookmarkCreated(node.id, node);
+
+    // New node store is created for a folder
+    expect(nodeStoreMap.size).toBe(NUM_BOOKMARK_ROOTS + 2);
+    expect(nodeStoreMap.get(node.id)).toBeDefined();
+    expect(getFolderNode(nodeStoreMap.get(node.id))).toMatchObject({
+      id: node.id,
+      type: Treetop.NodeType.Folder,
+      title: node.title,
+      children: node.children,
+    });
+
+    // New folder node appears in parent node's children
+    expect(getFolderNode(nodeStoreMap.get(folderNode.id)).children.length).toBe(
+      2
+    );
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode.id)).children
+    ).toContainEqual({
+      id: node.id,
+      type: Treetop.NodeType.Folder,
+      title: node.title,
+      children: [],
+    });
+  });
+});
+
+describe('handleBookmarkRemoved', () => {
+  let baseNode: browser.bookmarks.BookmarkTreeNode;
+  let folderNode1: browser.bookmarks.BookmarkTreeNode;
+  let folderNode2: browser.bookmarks.BookmarkTreeNode;
+  let bookmarkNode1: browser.bookmarks.BookmarkTreeNode;
+  let bookmarkNode2: browser.bookmarks.BookmarkTreeNode;
+  let bookmarkNode3: browser.bookmarks.BookmarkTreeNode;
+  let bookmarkNode4: browser.bookmarks.BookmarkTreeNode;
+  let separatorNode: browser.bookmarks.BookmarkTreeNode;
+
+  beforeEach(async () => {
+    // Create bookmarks tree:
+    // base
+    //   ├── bookmarkNode1
+    //   └─── folderNode1
+    //       ├── bookmarkNode2
+    //       ├── bookmarkNode3
+    //       └── folderNode2
+    //           ├── bookmarkNode4
+    //           └── separatorNode
+    baseNode = bookmarksRoot.children![0];
+    bookmarkNode1 = createBrowserBookmarkNode(baseNode);
+    folderNode1 = createBrowserFolderNode(baseNode);
+    bookmarkNode2 = createBrowserBookmarkNode(folderNode1);
+    bookmarkNode3 = createBrowserBookmarkNode(folderNode1);
+    folderNode2 = createBrowserFolderNode(folderNode1);
+    bookmarkNode4 = createBrowserBookmarkNode(folderNode2);
+    separatorNode = createBrowserSeparatorNode(folderNode2);
+    mockBrowser.bookmarks.getTree.expect.andResolve(bookmarksTree);
+    await bookmarksManager.loadBookmarks();
+    expect(nodeStoreMap.size).toBe(NUM_BOOKMARK_ROOTS + 2);
+    expect(nodeStoreMap.get(baseNode.id)).toBeDefined();
+    expect(getFolderNode(nodeStoreMap.get(baseNode.id)).children.length).toBe(
+      2
+    );
+    expect(nodeStoreMap.get(folderNode1.id)).toBeDefined();
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode1.id)).children.length
+    ).toBe(3);
+    expect(nodeStoreMap.get(folderNode2.id)).toBeDefined();
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode2.id)).children.length
+    ).toBe(2);
+
+    bookmarkNode1;
+  });
+
+  it('removed bookmark', async () => {
+    const children = folderNode2.children!;
+    delete folderNode2.children;
+    children.shift();
+    mockBrowser.bookmarks.get.expect(folderNode2.id).andResolve([folderNode2]);
+    mockBrowser.bookmarks.getChildren
+      .expect(folderNode2.id)
+      .andResolve(children);
+    expect(folderNode2.id).toBe(bookmarkNode4.parentId);
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode2.id)).children.length
+    ).toBe(2);
+
+    const initialNodeStoreMapSize = nodeStoreMap.size;
+
+    // Call bookmark removed handler
+    const removeInfo: browser.bookmarks._OnRemovedRemoveInfo = {
+      parentId: bookmarkNode4.parentId!,
+      index: 0,
+      node: bookmarkNode4,
+    };
+    const removedNodeIds = await bookmarksManager.handleBookmarkRemoved(
+      removeInfo.node.id,
+      removeInfo
+    );
+
+    expect(removedNodeIds.length).toBe(1);
+    expect(removedNodeIds).toContain(bookmarkNode4.id);
+    expect(nodeStoreMap.size).toBe(initialNodeStoreMapSize);
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode2.id)).children.length
+    ).toBe(1);
+  });
+
+  it('removed separator', async () => {
+    const children = folderNode2.children!;
+    delete folderNode2.children;
+    children.pop();
+    mockBrowser.bookmarks.get.expect(folderNode2.id).andResolve([folderNode2]);
+    mockBrowser.bookmarks.getChildren
+      .expect(folderNode2.id)
+      .andResolve(children);
+    expect(folderNode2.id).toBe(separatorNode.parentId);
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode2.id)).children.length
+    ).toBe(2);
+    const initialNodeStoreMapSize = nodeStoreMap.size;
+
+    // Call bookmark removed handler
+    const removeInfo: browser.bookmarks._OnRemovedRemoveInfo = {
+      parentId: separatorNode.parentId!,
+      index: 1,
+      node: separatorNode,
+    };
+    const removedNodeIds = await bookmarksManager.handleBookmarkRemoved(
+      removeInfo.node.id,
+      removeInfo
+    );
+
+    expect(removedNodeIds.length).toBe(1);
+    expect(removedNodeIds).toContain(separatorNode.id);
+    expect(nodeStoreMap.size).toBe(initialNodeStoreMapSize);
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode2.id)).children.length
+    ).toBe(1);
+  });
+
+  it('removed folder', async () => {
+    const children = baseNode.children!.slice(0, 1);
+    delete baseNode.children;
+    mockBrowser.bookmarks.get.expect(baseNode.id).andResolve([baseNode]);
+    mockBrowser.bookmarks.getChildren.expect(baseNode.id).andResolve(children);
+    expect(baseNode.id).toBe(folderNode1.parentId);
+    expect(getFolderNode(nodeStoreMap.get(baseNode.id)).children.length).toBe(
+      2
+    );
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode1.id)).children.length
+    ).toBe(3);
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode2.id)).children.length
+    ).toBe(2);
+    const initialNodeStoreMapSize = nodeStoreMap.size;
+
+    // Call bookmark removed handler
+    const removeInfo: browser.bookmarks._OnRemovedRemoveInfo = {
+      parentId: folderNode1.parentId!,
+      index: 1,
+      node: folderNode1,
+    };
+    const removedNodeIds = await bookmarksManager.handleBookmarkRemoved(
+      removeInfo.node.id,
+      removeInfo
+    );
+
+    expect(removedNodeIds.length).toBe(6);
+    expect(removedNodeIds).toContain(folderNode1.id);
+    expect(removedNodeIds).toContain(bookmarkNode2.id);
+    expect(removedNodeIds).toContain(bookmarkNode3.id);
+    expect(removedNodeIds).toContain(folderNode2.id);
+    expect(removedNodeIds).toContain(bookmarkNode4.id);
+    expect(removedNodeIds).toContain(separatorNode.id);
+    expect(nodeStoreMap.size).toBe(initialNodeStoreMapSize - 2);
+    expect(getFolderNode(nodeStoreMap.get(baseNode.id)).children.length).toBe(
+      1
+    );
+  });
+});
+
+describe('handleBookmarkChanged', () => {
+  let baseNode: browser.bookmarks.BookmarkTreeNode;
+  let folderNode1: browser.bookmarks.BookmarkTreeNode;
+  let bookmarkNode1: browser.bookmarks.BookmarkTreeNode;
+  let bookmarkNode2: browser.bookmarks.BookmarkTreeNode;
+
+  beforeEach(async () => {
+    // Create bookmarks tree:
+    // base
+    //   └─── folderNode1
+    //       ├── bookmarkNode1
+    //       └── bookmarkNode2
+    baseNode = bookmarksRoot.children![0];
+    folderNode1 = createBrowserFolderNode(baseNode);
+    bookmarkNode1 = createBrowserBookmarkNode(folderNode1);
+    bookmarkNode2 = createBrowserBookmarkNode(folderNode1);
+    mockBrowser.bookmarks.getTree.expect.andResolve(bookmarksTree);
+    await bookmarksManager.loadBookmarks();
+    expect(nodeStoreMap.size).toBe(NUM_BOOKMARK_ROOTS + 1);
+    expect(nodeStoreMap.get(baseNode.id)).toBeDefined();
+    expect(getFolderNode(nodeStoreMap.get(baseNode.id)).children.length).toBe(
+      1
+    );
+    expect(nodeStoreMap.get(folderNode1.id)).toBeDefined();
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode1.id)).children.length
+    ).toBe(2);
+  });
+
+  it('changed bookmark', async () => {
+    expect(folderNode1.id).toBe(bookmarkNode1.parentId);
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode1.id)).children.length
+    ).toBe(2);
+    expect(
+      (getFolderNode(nodeStoreMap.get(folderNode1.id))
+        .children[0] as Treetop.BookmarkNode).title
+    ).toBe(bookmarkNode1.title);
+    expect(
+      (getFolderNode(nodeStoreMap.get(folderNode1.id))
+        .children[0] as Treetop.BookmarkNode).url
+    ).toBe(bookmarkNode1.url);
+    const initialNodeStoreMapSize = nodeStoreMap.size;
+
+    bookmarkNode1.title = faker.random.words();
+    bookmarkNode1.url = faker.internet.url();
+    folderNode1.children![0] = bookmarkNode1;
+    mockBrowser.bookmarks.get
+      .expect(bookmarkNode1.id)
+      .andResolve([bookmarkNode1]);
+    mockBrowser.bookmarks.get.expect(folderNode1.id).andResolve([folderNode1]);
+    mockBrowser.bookmarks.getChildren
+      .expect(folderNode1.id)
+      .andResolve(folderNode1.children!);
+
+    // Call bookmark changed handler
+    const changeInfo: browser.bookmarks._OnChangedChangeInfo = {
+      title: bookmarkNode1.title,
+      url: bookmarkNode1.url,
+    };
+    await bookmarksManager.handleBookmarkChanged(bookmarkNode1.id, changeInfo);
+
+    expect(nodeStoreMap.size).toBe(initialNodeStoreMapSize);
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode1.id)).children.length
+    ).toBe(2);
+    expect(
+      (getFolderNode(nodeStoreMap.get(folderNode1.id))
+        .children[0] as Treetop.BookmarkNode).title
+    ).toBe(bookmarkNode1.title);
+    expect(
+      (getFolderNode(nodeStoreMap.get(folderNode1.id))
+        .children[0] as Treetop.BookmarkNode).url
+    ).toBe(bookmarkNode1.url);
+  });
+
+  it('changed folder', async () => {
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode1.id)).children.length
+    ).toBe(2);
+    expect(getFolderNode(nodeStoreMap.get(folderNode1.id)).children[0].id).toBe(
+      bookmarkNode1.id
+    );
+    expect(getFolderNode(nodeStoreMap.get(folderNode1.id)).children[1].id).toBe(
+      bookmarkNode2.id
+    );
+    const initialNodeStoreMapSize = nodeStoreMap.size;
+
+    folderNode1.title = faker.random.words();
+    mockBrowser.bookmarks.get.expect(folderNode1.id).andResolve([folderNode1]);
+    mockBrowser.bookmarks.getChildren
+      .expect(folderNode1.id)
+      .andResolve(folderNode1.children!);
+
+    // Call bookmark changed handler
+    const changeInfo: browser.bookmarks._OnChangedChangeInfo = {
+      title: folderNode1.title,
+    };
+    await bookmarksManager.handleBookmarkChanged(folderNode1.id, changeInfo);
+
+    expect(nodeStoreMap.size).toBe(initialNodeStoreMapSize);
+    expect(getFolderNode(nodeStoreMap.get(folderNode1.id)).title).toBe(
+      folderNode1.title
+    );
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode1.id)).children.length
+    ).toBe(2);
+    expect(getFolderNode(nodeStoreMap.get(folderNode1.id)).children[0].id).toBe(
+      bookmarkNode1.id
+    );
+    expect(getFolderNode(nodeStoreMap.get(folderNode1.id)).children[1].id).toBe(
+      bookmarkNode2.id
+    );
+  });
+});
+
+describe('handleBookmarkMoved', () => {
+  let baseNode: browser.bookmarks.BookmarkTreeNode;
+  let folderNode1: browser.bookmarks.BookmarkTreeNode;
+  let bookmarkNode1: browser.bookmarks.BookmarkTreeNode;
+  let bookmarkNode2: browser.bookmarks.BookmarkTreeNode;
+  let bookmarkNode3: browser.bookmarks.BookmarkTreeNode;
+
+  beforeEach(async () => {
+    // Create bookmarks tree:
+    // base
+    //   ├── bookmarkNode1
+    //   └─── folderNode1
+    //       ├── bookmarkNode2
+    //       └── bookmarkNode3
+    baseNode = bookmarksRoot.children![0];
+    bookmarkNode1 = createBrowserBookmarkNode(baseNode);
+    folderNode1 = createBrowserFolderNode(baseNode);
+    bookmarkNode2 = createBrowserBookmarkNode(folderNode1);
+    bookmarkNode3 = createBrowserBookmarkNode(folderNode1);
+    mockBrowser.bookmarks.getTree.expect.andResolve(bookmarksTree);
+    await bookmarksManager.loadBookmarks();
+    expect(nodeStoreMap.size).toBe(NUM_BOOKMARK_ROOTS + 1);
+    expect(nodeStoreMap.get(baseNode.id)).toBeDefined();
+    expect(getFolderNode(nodeStoreMap.get(baseNode.id)).children.length).toBe(
+      2
+    );
+    expect(nodeStoreMap.get(folderNode1.id)).toBeDefined();
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode1.id)).children.length
+    ).toBe(2);
+    bookmarkNode1;
+  });
+
+  it('moved within folder', async () => {
+    expect(baseNode.id).toBe(bookmarkNode1.parentId);
+    expect(baseNode.id).toBe(folderNode1.parentId);
+    expect(folderNode1.id).toBe(bookmarkNode2.parentId);
+    expect(folderNode1.id).toBe(bookmarkNode3.parentId);
+    expect(getFolderNode(nodeStoreMap.get(folderNode1.id)).children[0].id).toBe(
+      bookmarkNode2.id
+    );
+    expect(getFolderNode(nodeStoreMap.get(folderNode1.id)).children[1].id).toBe(
+      bookmarkNode3.id
+    );
+    const initialNodeStoreMapSize = nodeStoreMap.size;
+
+    // Move bookmarkNode3 to index 0
+    const children = folderNode1.children!;
+    const moveInfo: browser.bookmarks._OnMovedMoveInfo = {
+      parentId: bookmarkNode3.parentId!,
+      index: 0,
+      oldParentId: bookmarkNode3.parentId!,
+      oldIndex: 1,
+    };
+    [children[0], children[1]] = [children[1], children[0]];
+    mockBrowser.bookmarks.get.expect(folderNode1.id).andResolve([folderNode1]);
+    mockBrowser.bookmarks.getChildren
+      .expect(folderNode1.id)
+      .andResolve(folderNode1.children!);
+
+    // Call bookmark moved handler
+    await bookmarksManager.handleBookmarkMoved(bookmarkNode3.id, moveInfo);
+
+    expect(nodeStoreMap.size).toBe(initialNodeStoreMapSize);
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode1.id)).children.length
+    ).toBe(2);
+    expect(getFolderNode(nodeStoreMap.get(folderNode1.id)).children[0].id).toBe(
+      bookmarkNode3.id
+    );
+    expect(getFolderNode(nodeStoreMap.get(folderNode1.id)).children[1].id).toBe(
+      bookmarkNode2.id
+    );
+  });
+
+  it('moved to parent folder', async () => {
+    expect(baseNode.id).toBe(bookmarkNode1.parentId);
+    expect(baseNode.id).toBe(folderNode1.parentId);
+    expect(folderNode1.id).toBe(bookmarkNode2.parentId);
+    expect(folderNode1.id).toBe(bookmarkNode3.parentId);
+    expect(getFolderNode(nodeStoreMap.get(baseNode.id)).children[0].id).toBe(
+      bookmarkNode1.id
+    );
+    expect(getFolderNode(nodeStoreMap.get(baseNode.id)).children[1].id).toBe(
+      folderNode1.id
+    );
+    expect(getFolderNode(nodeStoreMap.get(folderNode1.id)).children[0].id).toBe(
+      bookmarkNode2.id
+    );
+    expect(getFolderNode(nodeStoreMap.get(folderNode1.id)).children[1].id).toBe(
+      bookmarkNode3.id
+    );
+    const initialNodeStoreMapSize = nodeStoreMap.size;
+
+    // Move bookmarkNode3 to base folder
+    baseNode.children!.unshift(folderNode1.children!.pop()!);
+    const moveInfo: browser.bookmarks._OnMovedMoveInfo = {
+      parentId: baseNode.id,
+      index: 0,
+      oldParentId: folderNode1.id,
+      oldIndex: 1,
+    };
+    mockBrowser.bookmarks.get.expect(baseNode.id).andResolve([baseNode]);
+    mockBrowser.bookmarks.getChildren
+      .expect(baseNode.id)
+      .andResolve(baseNode.children!);
+    mockBrowser.bookmarks.get.expect(folderNode1.id).andResolve([folderNode1]);
+    mockBrowser.bookmarks.getChildren
+      .expect(folderNode1.id)
+      .andResolve(folderNode1.children!);
+
+    // Call bookmark moved handler
+    await bookmarksManager.handleBookmarkMoved(bookmarkNode3.id, moveInfo);
+
+    expect(nodeStoreMap.size).toBe(initialNodeStoreMapSize);
+    expect(getFolderNode(nodeStoreMap.get(baseNode.id)).children.length).toBe(
+      3
+    );
+    expect(getFolderNode(nodeStoreMap.get(baseNode.id)).children[0].id).toBe(
+      bookmarkNode3.id
+    );
+    expect(getFolderNode(nodeStoreMap.get(baseNode.id)).children[1].id).toBe(
+      bookmarkNode1.id
+    );
+    expect(getFolderNode(nodeStoreMap.get(baseNode.id)).children[2].id).toBe(
+      folderNode1.id
+    );
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode1.id)).children.length
+    ).toBe(1);
+    expect(getFolderNode(nodeStoreMap.get(folderNode1.id)).children[0].id).toBe(
+      bookmarkNode2.id
+    );
+  });
+
+  it('moved to child folder', async () => {
+    expect(baseNode.id).toBe(bookmarkNode1.parentId);
+    expect(baseNode.id).toBe(folderNode1.parentId);
+    expect(folderNode1.id).toBe(bookmarkNode2.parentId);
+    expect(folderNode1.id).toBe(bookmarkNode3.parentId);
+    expect(getFolderNode(nodeStoreMap.get(baseNode.id)).children[0].id).toBe(
+      bookmarkNode1.id
+    );
+    expect(getFolderNode(nodeStoreMap.get(baseNode.id)).children[1].id).toBe(
+      folderNode1.id
+    );
+    expect(getFolderNode(nodeStoreMap.get(folderNode1.id)).children[0].id).toBe(
+      bookmarkNode2.id
+    );
+    expect(getFolderNode(nodeStoreMap.get(folderNode1.id)).children[1].id).toBe(
+      bookmarkNode3.id
+    );
+    const initialNodeStoreMapSize = nodeStoreMap.size;
+
+    // Move bookmarkNode1 to folderNode1
+    folderNode1.children!.unshift(baseNode.children!.shift()!);
+    const moveInfo: browser.bookmarks._OnMovedMoveInfo = {
+      parentId: folderNode1.id,
+      index: 0,
+      oldParentId: baseNode.id,
+      oldIndex: 0,
+    };
+    mockBrowser.bookmarks.get.expect(folderNode1.id).andResolve([folderNode1]);
+    mockBrowser.bookmarks.getChildren
+      .expect(folderNode1.id)
+      .andResolve(folderNode1.children!);
+    mockBrowser.bookmarks.get.expect(baseNode.id).andResolve([baseNode]);
+    mockBrowser.bookmarks.getChildren
+      .expect(baseNode.id)
+      .andResolve(baseNode.children!);
+
+    // Call bookmark moved handler
+    await bookmarksManager.handleBookmarkMoved(bookmarkNode1.id, moveInfo);
+
+    expect(nodeStoreMap.size).toBe(initialNodeStoreMapSize);
+    expect(getFolderNode(nodeStoreMap.get(baseNode.id)).children.length).toBe(
+      1
+    );
+    expect(getFolderNode(nodeStoreMap.get(baseNode.id)).children[0].id).toBe(
+      folderNode1.id
+    );
+    expect(
+      getFolderNode(nodeStoreMap.get(folderNode1.id)).children.length
+    ).toBe(3);
+    expect(getFolderNode(nodeStoreMap.get(folderNode1.id)).children[0].id).toBe(
+      bookmarkNode1.id
+    );
+    expect(getFolderNode(nodeStoreMap.get(folderNode1.id)).children[1].id).toBe(
+      bookmarkNode2.id
+    );
+    expect(getFolderNode(nodeStoreMap.get(folderNode1.id)).children[2].id).toBe(
+      bookmarkNode3.id
+    );
+  });
+});
diff --git a/test/treetop/Folder.svelte.test.ts b/test/treetop/Folder.svelte.test.ts
new file mode 100644
index 0000000..c4e1d18
--- /dev/null
+++ b/test/treetop/Folder.svelte.test.ts
@@ -0,0 +1,524 @@
+/* eslint no-irregular-whitespace: ["error", { "skipComments": true }] */
+
+import { Writable, writable } from 'svelte/store';
+import { render, screen } from '@testing-library/svelte';
+
+import { BOOKMARKS_ROOT_GUID } from '@Treetop/treetop/constants';
+import Folder from '@Treetop/treetop/Folder.svelte';
+import type * as Treetop from '@Treetop/treetop/types';
+
+import ContextWrapper from '../utils/ContextWrapper.svelte';
+import {
+  createBookmarkNode,
+  createFolderNode,
+  createSeparatorNode,
+} from '../utils/factories';
+
+// Folder component requirements
+let nodeStoreMap: Treetop.NodeStoreMap;
+let nodeId: string;
+
+// Bookmark component requirements
+let lastVisitTimeMap: Treetop.LastVisitTimeMap;
+let truncate: Writable<boolean>;
+let tooltips: Writable<boolean>;
+
+let rootNode: Treetop.FolderNode;
+
+const setup = () => {
+  render(ContextWrapper, {
+    Component: Folder,
+    Props: {
+      nodeId,
+      root: true,
+    },
+    Context: {
+      nodeStoreMap,
+      lastVisitTimeMap,
+      truncate,
+      tooltips,
+    },
+  });
+};
+
+// TODO: Consider writing custom matcher:
+// https://jestjs.io/docs/en/expect.html#expectextendmatchers
+/**
+ * Given a child element and a folder heading link element, expect that the child
+ * element is in the folder contents element.
+ */
+const expectToBeInContentsOfFolder = (
+  child: HTMLElement,
+  headerLink: HTMLElement
+) => {
+  const contents = child.parentElement;
+  expect(contents).not.toBeNull();
+  expect(contents!).toHaveClass('contents');
+
+  const heading = headerLink.parentElement?.parentElement;
+  expect(heading).not.toBeNull();
+  expect(heading!).toHaveClass('heading');
+
+  expect(contents!.parentElement).not.toBeNull();
+  expect(heading!.parentElement).not.toBeNull();
+  expect(contents!.parentElement!).toBe(heading!.parentElement!);
+};
+
+// TODO: Consider writing custom matcher:
+// https://jestjs.io/docs/en/expect.html#expectextendmatchers
+/**
+ * Given a child element and a folder heading link element, expect that the child
+ * element is a subfolder in the folder contents element.
+ */
+const expectFolderInFolder = (child: HTMLElement, headerLink: HTMLElement) => {
+  const contents =
+    child.parentElement?.parentElement?.parentElement?.parentElement;
+  expect(contents).not.toBeNull();
+  expect(contents!).toHaveClass('contents');
+
+  const heading = headerLink.parentElement?.parentElement;
+  expect(heading).not.toBeNull();
+  expect(heading!).toHaveClass('heading');
+
+  expect(contents!.parentElement).not.toBeNull();
+  expect(heading!.parentElement).not.toBeNull();
+  expect(contents!.parentElement!).toBe(heading!.parentElement!);
+};
+
+beforeEach(() => {
+  nodeStoreMap = new Map() as Treetop.NodeStoreMap;
+  lastVisitTimeMap = new Map() as Treetop.LastVisitTimeMap;
+  truncate = writable(false);
+  tooltips = writable(false);
+});
+
+describe('rooted at bookmarks root', () => {
+  it('no children', () => {
+    // Create node tree:
+    // rootNode
+    rootNode = createFolderNode();
+    rootNode.id = BOOKMARKS_ROOT_GUID;
+
+    nodeStoreMap.set(rootNode.id, writable(rootNode));
+
+    nodeId = rootNode.id;
+
+    mockBrowser.i18n.getMessage.expect('emptyFolder').andReturn('Empty folder');
+
+    setup();
+
+    expect(
+      screen.getByRole('link', { name: rootNode.title })
+    ).toBeInTheDocument();
+    expect(screen.getByText(/^empty folder/i)).toBeInTheDocument();
+
+    const link = screen.getByRole('link', { name: rootNode.title });
+    expect(link.dataset.nodeId).toBe(rootNode.id);
+    expect(link).toHaveAttribute('href', `#${rootNode.id}`);
+
+    const emptyFolder = screen.getByText(/^empty folder/i);
+    expectToBeInContentsOfFolder(emptyFolder, link);
+  });
+
+  it('uses fallback title', () => {
+    // Create node tree:
+    // rootNode
+    rootNode = createFolderNode();
+    rootNode.id = BOOKMARKS_ROOT_GUID;
+    rootNode.title = '';
+
+    nodeStoreMap.set(rootNode.id, writable(rootNode));
+
+    nodeId = rootNode.id;
+
+    const title = 'Bookmarks';
+    mockBrowser.i18n.getMessage.expect('bookmarks').andReturn(title);
+    mockBrowser.i18n.getMessage.expect('emptyFolder').andReturn('Empty folder');
+
+    setup();
+
+    expect(screen.getByRole('link', { name: title })).toBeInTheDocument();
+    expect(screen.getByText(/^empty folder/i)).toBeInTheDocument();
+
+    const link = screen.getByRole('link', { name: title });
+    expect(link.dataset.nodeId).toBe(rootNode.id);
+    expect(link).toHaveAttribute('href', `#${rootNode.id}`);
+  });
+
+  it('one empty child folder', () => {
+    // Create node tree:
+    // rootNode
+    //   └── folderNode
+    rootNode = createFolderNode();
+    rootNode.id = BOOKMARKS_ROOT_GUID;
+
+    const folderNode = createFolderNode();
+    folderNode.parentId = rootNode.id;
+    rootNode.children.push(folderNode);
+
+    nodeStoreMap.set(rootNode.id, writable(rootNode));
+    nodeStoreMap.set(folderNode.id, writable(folderNode));
+
+    nodeId = rootNode.id;
+
+    mockBrowser.i18n.getMessage.expect('emptyFolder').andReturn('Empty folder');
+
+    setup();
+
+    expect(
+      screen.getByRole('link', { name: rootNode.title })
+    ).toBeInTheDocument();
+    expect(
+      screen.getByRole('link', { name: folderNode.title })
+    ).toBeInTheDocument();
+    expect(screen.getByText(/^empty folder/i)).toBeInTheDocument();
+
+    const rootNodeLink = screen.getByRole('link', { name: rootNode.title });
+    expect(rootNodeLink.dataset.nodeId).toBe(rootNode.id);
+    expect(rootNodeLink).toHaveAttribute('href', `#${rootNode.id}`);
+
+    const folderNodeLink = screen.getByRole('link', { name: folderNode.title });
+    expect(folderNodeLink.dataset.nodeId).toBe(folderNode.id);
+    expect(folderNodeLink).toHaveAttribute('href', `#${folderNode.id}`);
+
+    const emptyFolder = screen.getByText(/^empty folder/i);
+    expectToBeInContentsOfFolder(emptyFolder, folderNodeLink);
+  });
+
+  it('one child folder with children', () => {
+    // Create node tree:
+    // rootNode
+    //   └── folderNode1
+    //      ├── bookmarkNode
+    //      ├── bookmarkNode
+    //      └── folderNode2
+    //         └── bookmarkNode
+    rootNode = createFolderNode();
+    rootNode.id = BOOKMARKS_ROOT_GUID;
+
+    const folderNode1 = createFolderNode();
+    folderNode1.parentId = rootNode.id;
+    folderNode1.children.push(createBookmarkNode());
+    folderNode1.children.push(createBookmarkNode());
+    rootNode.children.push(folderNode1);
+
+    const folderNode2 = createFolderNode();
+    folderNode2.parentId = folderNode1.id;
+    folderNode2.children.push(createBookmarkNode());
+    folderNode1.children.push(folderNode2);
+
+    nodeStoreMap.set(rootNode.id, writable(rootNode));
+    nodeStoreMap.set(folderNode1.id, writable(folderNode1));
+    nodeStoreMap.set(folderNode2.id, writable(folderNode2));
+
+    nodeId = rootNode.id;
+
+    setup();
+
+    expect(
+      screen.getByRole('link', { name: rootNode.title })
+    ).toBeInTheDocument();
+    expect(
+      screen.getByRole('link', { name: folderNode1.title })
+    ).toBeInTheDocument();
+    expect(
+      screen.getByRole('link', { name: folderNode2.title })
+    ).toBeInTheDocument();
+    expect(screen.queryByText(/^empty folder/i)).not.toBeInTheDocument();
+    expect(
+      screen.getByRole('link', {
+        name: (folderNode1.children[0] as Treetop.BookmarkNode).title,
+      })
+    ).toBeInTheDocument();
+    expect(
+      screen.getByRole('link', {
+        name: (folderNode1.children[1] as Treetop.BookmarkNode).title,
+      })
+    ).toBeInTheDocument();
+    expect(
+      screen.getByRole('link', {
+        name: (folderNode2.children[0] as Treetop.BookmarkNode).title,
+      })
+    ).toBeInTheDocument();
+
+    const rootNodeLink = screen.getByRole('link', { name: rootNode.title });
+    expect(rootNodeLink.dataset.nodeId).toBe(rootNode.id);
+    expect(rootNodeLink).toHaveAttribute('href', `#${rootNode.id}`);
+
+    const folderNode1Link = screen.getByRole('link', {
+      name: folderNode1.title,
+    });
+    expect(folderNode1Link.dataset.nodeId).toBe(folderNode1.id);
+    expect(folderNode1Link).toHaveAttribute('href', `#${folderNode1.id}`);
+    expectFolderInFolder(folderNode1Link, rootNodeLink);
+
+    const bookmarkLink1 = screen.getByRole('link', {
+      name: (folderNode1.children[0] as Treetop.BookmarkNode).title,
+    });
+    const bookmarkLink2 = screen.getByRole('link', {
+      name: (folderNode1.children[1] as Treetop.BookmarkNode).title,
+    });
+    expect(bookmarkLink1.dataset.nodeId).toBe(folderNode1.children[0].id);
+    expect(bookmarkLink1).toHaveAttribute(
+      'href',
+      (folderNode1.children[0] as Treetop.BookmarkNode).url
+    );
+    expect(bookmarkLink2.dataset.nodeId).toBe(folderNode1.children[1].id);
+    expect(bookmarkLink2).toHaveAttribute(
+      'href',
+      (folderNode1.children[1] as Treetop.BookmarkNode).url
+    );
+    expectToBeInContentsOfFolder(bookmarkLink1, folderNode1Link);
+    expectToBeInContentsOfFolder(bookmarkLink2, folderNode1Link);
+
+    const folderNode2Link = screen.getByRole('link', {
+      name: folderNode2.title,
+    });
+    expect(folderNode2Link.dataset.nodeId).toBe(folderNode2.id);
+    expect(folderNode2Link).toHaveAttribute('href', `#${folderNode2.id}`);
+    expectFolderInFolder(folderNode2Link, folderNode1Link);
+
+    const bookmarkLink3 = screen.getByRole('link', {
+      name: (folderNode2.children[0] as Treetop.BookmarkNode).title,
+    });
+    expect(bookmarkLink3.dataset.nodeId).toBe(folderNode2.children[0].id);
+    expect(bookmarkLink3).toHaveAttribute(
+      'href',
+      (folderNode2.children[0] as Treetop.BookmarkNode).url
+    );
+    expectToBeInContentsOfFolder(bookmarkLink3, folderNode2Link);
+  });
+
+  it('two child folders with children', () => {
+    // Create node tree:
+    // rootNode
+    //   ├── folderNode1
+    //   │  └── bookmarkNode
+    //   └── folderNode2
+    //      ├── bookmarkNode
+    //      └── separatorNode
+    rootNode = createFolderNode();
+    rootNode.id = BOOKMARKS_ROOT_GUID;
+
+    const folderNode1 = createFolderNode();
+    folderNode1.parentId = rootNode.id;
+    folderNode1.children.push(createBookmarkNode());
+    rootNode.children.push(folderNode1);
+
+    const folderNode2 = createFolderNode();
+    folderNode2.parentId = rootNode.id;
+    folderNode2.children.push(createBookmarkNode());
+    folderNode2.children.push(createSeparatorNode());
+    rootNode.children.push(folderNode2);
+
+    nodeStoreMap.set(rootNode.id, writable(rootNode));
+    nodeStoreMap.set(folderNode1.id, writable(folderNode1));
+    nodeStoreMap.set(folderNode2.id, writable(folderNode2));
+
+    nodeId = rootNode.id;
+
+    setup();
+
+    expect(
+      screen.getByRole('link', { name: rootNode.title })
+    ).toBeInTheDocument();
+    expect(
+      screen.getByRole('link', { name: folderNode1.title })
+    ).toBeInTheDocument();
+    expect(
+      screen.getByRole('link', { name: folderNode2.title })
+    ).toBeInTheDocument();
+    expect(screen.queryByText(/^empty folder/i)).not.toBeInTheDocument();
+    expect(
+      screen.getByRole('link', {
+        name: (folderNode1.children[0] as Treetop.BookmarkNode).title,
+      })
+    ).toBeInTheDocument();
+    expect(
+      screen.getByRole('link', {
+        name: (folderNode2.children[0] as Treetop.BookmarkNode).title,
+      })
+    ).toBeInTheDocument();
+    expect(screen.getByRole('separator')).toBeInTheDocument();
+
+    const rootNodeLink = screen.getByRole('link', { name: rootNode.title });
+    expect(rootNodeLink.dataset.nodeId).toBe(rootNode.id);
+    expect(rootNodeLink).toHaveAttribute('href', `#${rootNode.id}`);
+
+    const folderNode1Link = screen.getByRole('link', {
+      name: folderNode1.title,
+    });
+    expect(folderNode1Link.dataset.nodeId).toBe(folderNode1.id);
+    expect(folderNode1Link).toHaveAttribute('href', `#${folderNode1.id}`);
+    expectFolderInFolder(folderNode1Link, rootNodeLink);
+
+    const bookmarkLink1 = screen.getByRole('link', {
+      name: (folderNode1.children[0] as Treetop.BookmarkNode).title,
+    });
+    expect(bookmarkLink1.dataset.nodeId).toBe(folderNode1.children[0].id);
+    expect(bookmarkLink1).toHaveAttribute(
+      'href',
+      (folderNode1.children[0] as Treetop.BookmarkNode).url
+    );
+    expectToBeInContentsOfFolder(bookmarkLink1, folderNode1Link);
+
+    const folderNode2Link = screen.getByRole('link', {
+      name: folderNode2.title,
+    });
+    expect(folderNode2Link.dataset.nodeId).toBe(folderNode2.id);
+    expect(folderNode2Link).toHaveAttribute('href', `#${folderNode2.id}`);
+    expectFolderInFolder(folderNode2Link, rootNodeLink);
+
+    const bookmarkLink2 = screen.getByRole('link', {
+      name: (folderNode2.children[0] as Treetop.BookmarkNode).title,
+    });
+    expect(bookmarkLink2.dataset.nodeId).toBe(folderNode2.children[0].id);
+    expect(bookmarkLink2).toHaveAttribute(
+      'href',
+      (folderNode2.children[0] as Treetop.BookmarkNode).url
+    );
+    expectToBeInContentsOfFolder(bookmarkLink2, folderNode2Link);
+
+    const separator = screen.getByRole('separator');
+    expectToBeInContentsOfFolder(separator, folderNode2Link);
+  });
+});
+
+describe('rooted at subfolder', () => {
+  let folderNode1: Treetop.FolderNode;
+  let folderNode2: Treetop.FolderNode;
+  let folderNode3: Treetop.FolderNode;
+
+  beforeEach(() => {
+    // Create node tree:
+    // rootNode
+    //   ├── folderNode1
+    //   │  └── bookmarkNode
+    //   └── folderNode2
+    //      ├── bookmarkNode
+    //      └── folderNode3
+    //         └── bookmarkNode
+    rootNode = createFolderNode();
+    rootNode.id = BOOKMARKS_ROOT_GUID;
+
+    folderNode1 = createFolderNode();
+    folderNode1.parentId = rootNode.id;
+    folderNode1.children.push(createBookmarkNode());
+    rootNode.children.push(folderNode1);
+
+    folderNode2 = createFolderNode();
+    folderNode2.parentId = rootNode.id;
+    folderNode2.children.push(createBookmarkNode());
+    rootNode.children.push(folderNode2);
+
+    folderNode3 = createFolderNode();
+    folderNode3.parentId = folderNode2.id;
+    folderNode3.children.push(createBookmarkNode());
+    folderNode2.children.push(folderNode3);
+
+    nodeStoreMap.set(rootNode.id, writable(rootNode));
+    nodeStoreMap.set(folderNode1.id, writable(folderNode1));
+    nodeStoreMap.set(folderNode2.id, writable(folderNode2));
+    nodeStoreMap.set(folderNode3.id, writable(folderNode3));
+
+    nodeId = folderNode2.id;
+
+    setup();
+  });
+
+  it('renders when rooted at subfolder', () => {
+    expect(
+      screen.getByRole('link', { name: rootNode.title })
+    ).toBeInTheDocument();
+    expect(
+      screen.queryByRole('link', { name: folderNode1.title })
+    ).not.toBeInTheDocument();
+    expect(
+      screen.getByRole('link', { name: folderNode2.title })
+    ).toBeInTheDocument();
+    expect(
+      screen.getByRole('link', { name: folderNode3.title })
+    ).toBeInTheDocument();
+    expect(screen.queryByText(/^empty folder/i)).not.toBeInTheDocument();
+    expect(
+      screen.getByRole('link', {
+        name: (folderNode2.children[0] as Treetop.BookmarkNode).title,
+      })
+    ).toBeInTheDocument();
+    expect(
+      screen.getByRole('link', {
+        name: (folderNode3.children[0] as Treetop.BookmarkNode).title,
+      })
+    ).toBeInTheDocument();
+
+    const rootNodeLink = screen.getByRole('link', { name: rootNode.title });
+    expect(rootNodeLink.dataset.nodeId).toBe(rootNode.id);
+    expect(rootNodeLink).toHaveAttribute('href', `#${rootNode.id}`);
+
+    const folderNode2Link = screen.getByRole('link', {
+      name: folderNode2.title,
+    });
+    expect(folderNode2Link.dataset.nodeId).toBe(folderNode2.id);
+    expect(folderNode2Link).toHaveAttribute('href', `#${folderNode2.id}`);
+
+    const bookmarkLink1 = screen.getByRole('link', {
+      name: (folderNode2.children[0] as Treetop.BookmarkNode).title,
+    });
+    expect(bookmarkLink1.dataset.nodeId).toBe(folderNode2.children[0].id);
+    expect(bookmarkLink1).toHaveAttribute(
+      'href',
+      (folderNode2.children[0] as Treetop.BookmarkNode).url
+    );
+    expectToBeInContentsOfFolder(bookmarkLink1, folderNode2Link);
+
+    const folderNode3Link = screen.getByRole('link', {
+      name: folderNode3.title,
+    });
+    expect(folderNode3Link.dataset.nodeId).toBe(folderNode3.id);
+    expect(folderNode3Link).toHaveAttribute('href', `#${folderNode3.id}`);
+    expectFolderInFolder(folderNode3Link, folderNode2Link);
+
+    const bookmarkLink2 = screen.getByRole('link', {
+      name: (folderNode3.children[0] as Treetop.BookmarkNode).title,
+    });
+    expect(bookmarkLink2.dataset.nodeId).toBe(folderNode3.children[0].id);
+    expect(bookmarkLink2).toHaveAttribute(
+      'href',
+      (folderNode3.children[0] as Treetop.BookmarkNode).url
+    );
+    expectToBeInContentsOfFolder(bookmarkLink2, folderNode3Link);
+  });
+
+  describe('breadcrumbs', () => {
+    it('text and links', () => {
+      const breadcrumbs = `${rootNode.title} / ${folderNode2.title}`;
+
+      const node = screen.getByText((_content, node) => {
+        if (node.children.length !== 2) {
+          return false;
+        }
+
+        const node1 = node.children[0] as HTMLElement;
+        if (node1.dataset.nodeId !== rootNode.id || !node1.textContent) {
+          return false;
+        }
+
+        const node2 = node.children[1] as HTMLElement;
+        if (node2.dataset.nodeId !== folderNode2.id || !node2.textContent) {
+          return false;
+        }
+
+        return `${node1.textContent} / ${node2.textContent}` === breadcrumbs;
+      });
+      expect(node).toBeInTheDocument();
+
+      const node1 = node.children[0] as HTMLElement;
+      expect(node1).toHaveAttribute('href', `#${rootNode.id}`);
+
+      const node2 = node.children[1] as HTMLElement;
+      expect(node2).toHaveAttribute('href', `#${folderNode2.id}`);
+    });
+  });
+});
+
+// TODO: Figure out how to test svelte:head, i.e. document title
diff --git a/test/treetop/HistoryManager.test.ts b/test/treetop/HistoryManager.test.ts
new file mode 100644
index 0000000..1338f88
--- /dev/null
+++ b/test/treetop/HistoryManager.test.ts
@@ -0,0 +1,388 @@
+/* eslint no-irregular-whitespace: ["error", { "skipComments": true }] */
+import { get, writable } from 'svelte/store';
+import faker from 'faker';
+
+import { HistoryManager } from '@Treetop/treetop/HistoryManager';
+import * as Treetop from '@Treetop/treetop/types';
+
+import {
+  createBookmarkNode,
+  createBrowserBookmarkNode,
+  createBrowserFolderNode,
+  createBrowserSeparatorNode,
+  createFolderNode,
+  createHistoryItem,
+  createOtherBookmarksNode,
+  createSeparatorNode,
+  createVisitItem,
+} from '../utils/factories';
+
+const getBookmarkNodes = (
+  folder: Treetop.FolderNode
+): Treetop.BookmarkNode[] => {
+  const bookmarkNodes = [];
+  for (const child of folder.children) {
+    if (child.type === Treetop.NodeType.Bookmark) {
+      bookmarkNodes.push(child);
+    }
+  }
+  return bookmarkNodes;
+};
+
+let nodeStoreMap: Treetop.NodeStoreMap;
+let lastVisitTimeMap: Treetop.LastVisitTimeMap;
+let historyManager: HistoryManager;
+let folderNode1: Treetop.FolderNode;
+let folderNode2: Treetop.FolderNode;
+
+beforeEach(() => {
+  nodeStoreMap = new Map() as Treetop.NodeStoreMap;
+  lastVisitTimeMap = new Map() as Treetop.LastVisitTimeMap;
+  historyManager = new HistoryManager(lastVisitTimeMap);
+
+  // Create node tree:
+  // folderNode1
+  //   ├── bookmarkNode
+  //   ├── bookmarkNode
+  //   ├── bookmarkNode
+  //   ├── separatorNode
+  //   ├── bookmarkNode
+  //   └── folderNode2
+  //      ├── bookmarkNode
+  //      ├── bookmarkNode
+  //      └── bookmarkNode
+
+  folderNode1 = createFolderNode();
+  for (let i = 0; i < 3; i++) {
+    folderNode1.children.push(createBookmarkNode());
+  }
+  folderNode1.children.push(createSeparatorNode());
+  folderNode1.children.push(createBookmarkNode());
+
+  folderNode2 = createFolderNode();
+  for (let i = 0; i < 3; i++) {
+    folderNode2.children.push(createBookmarkNode());
+  }
+  folderNode1.children.push(folderNode2);
+
+  nodeStoreMap.set(folderNode1.id, writable(folderNode1));
+  nodeStoreMap.set(folderNode2.id, writable(folderNode2));
+});
+
+describe('init', () => {
+  it('sets default last visit time for bookmarks', () => {
+    historyManager.init(nodeStoreMap);
+
+    expect(lastVisitTimeMap.size).toBe(7);
+
+    for (const lastVisitTimeStore of lastVisitTimeMap.values()) {
+      expect(get(lastVisitTimeStore)).toBe(0);
+    }
+  });
+});
+
+describe('loadHistory', () => {
+  beforeEach(() => {
+    historyManager.init(nodeStoreMap);
+  });
+
+  it('sets last visit time of visited bookmarks', async () => {
+    const visitTimeMap = new Map<string, number>();
+
+    const bookmarkNodes = [];
+    bookmarkNodes.push(...getBookmarkNodes(folderNode1));
+    bookmarkNodes.push(...getBookmarkNodes(folderNode2));
+    // Bookmarks alternate between unvisited and visited
+    bookmarkNodes.forEach((node, index) => {
+      const visitItems = [];
+      let visitTime = 0;
+      if (index & 1) {
+        const visitItem = createVisitItem();
+        visitTime = visitItem.visitTime!;
+        visitItems.push(visitItem);
+      }
+      visitTimeMap.set(node.id, visitTime);
+      mockBrowser.history.getVisits
+        .expect({ url: node.url })
+        .andResolve(visitItems);
+    });
+
+    await historyManager.loadHistory(nodeStoreMap);
+
+    expect(lastVisitTimeMap.size).toBe(7);
+    for (const [nodeId, lastVisitTimeStore] of lastVisitTimeMap.entries()) {
+      const visitTime = visitTimeMap.get(nodeId) ?? 0;
+      expect(get(lastVisitTimeStore)).toBe(visitTime);
+    }
+  });
+
+  it('no-op when called twice in a row', async () => {
+    const bookmarkNodes = [];
+    bookmarkNodes.push(...getBookmarkNodes(folderNode1));
+    bookmarkNodes.push(...getBookmarkNodes(folderNode2));
+    bookmarkNodes.forEach((node) => {
+      const visitItems = [createVisitItem()];
+      mockBrowser.history.getVisits
+        .expect({ url: node.url })
+        .andResolve(visitItems);
+    });
+
+    await historyManager.loadHistory(nodeStoreMap);
+    await historyManager.loadHistory(nodeStoreMap);
+  });
+});
+
+describe('unloadHistory', () => {
+  it('resets all last visit times', () => {
+    const nodeIds = [
+      faker.random.uuid(),
+      faker.random.uuid(),
+      faker.random.uuid(),
+    ];
+
+    for (const nodeId of nodeIds) {
+      lastVisitTimeMap.set(nodeId, writable(faker.random.number()));
+    }
+
+    historyManager.unloadHistory();
+
+    for (const nodeId of nodeIds) {
+      expect(get(lastVisitTimeMap.get(nodeId)!)).toBe(0);
+    }
+  });
+});
+
+describe('handleBookmarkCreated', () => {
+  it('sets default last visit time for a new unvisited bookmark', async () => {
+    const baseNode = createOtherBookmarksNode();
+    const bookmarkNode = createBrowserBookmarkNode(baseNode);
+
+    mockBrowser.history.getVisits
+      .expect({ url: bookmarkNode.url! })
+      .andResolve([]);
+
+    await historyManager.handleBookmarkCreated(bookmarkNode.id, bookmarkNode);
+
+    expect(lastVisitTimeMap.has(bookmarkNode.id)).toBe(true);
+    expect(get(lastVisitTimeMap.get(bookmarkNode.id)!)).toBe(0);
+  });
+
+  it('sets last visit time for a new visited bookmark', async () => {
+    const baseNode = createOtherBookmarksNode();
+    const bookmarkNode = createBrowserBookmarkNode(baseNode);
+
+    const visitItem = createVisitItem();
+    mockBrowser.history.getVisits
+      .expect({ url: bookmarkNode.url! })
+      .andResolve([visitItem]);
+
+    await historyManager.handleBookmarkCreated(bookmarkNode.id, bookmarkNode);
+
+    expect(lastVisitTimeMap.has(bookmarkNode.id)).toBe(true);
+    expect(get(lastVisitTimeMap.get(bookmarkNode.id)!)).toBe(
+      visitItem.visitTime!
+    );
+  });
+
+  it('ignores new folders', async () => {
+    const baseNode = createOtherBookmarksNode();
+    const folderNode = createBrowserFolderNode(baseNode);
+
+    await historyManager.handleBookmarkCreated(folderNode.id, folderNode);
+  });
+
+  it('ignores new separators', async () => {
+    const baseNode = createOtherBookmarksNode();
+    const separatorNode = createBrowserSeparatorNode(baseNode);
+
+    await historyManager.handleBookmarkCreated(separatorNode.id, separatorNode);
+  });
+});
+
+describe('handleBookmarkRemoved', () => {
+  it('removes last visit time for a bookmark', () => {
+    const baseNode = createOtherBookmarksNode();
+    const bookmarkNode = createBrowserBookmarkNode(baseNode);
+    lastVisitTimeMap.set(bookmarkNode.id, writable(0));
+    const initialSize = lastVisitTimeMap.size;
+
+    historyManager.handleBookmarkRemoved(bookmarkNode.id);
+
+    expect(lastVisitTimeMap.has(bookmarkNode.id)).toBe(false);
+    expect(lastVisitTimeMap.size).toBe(initialSize - 1);
+  });
+
+  it('ignores folders', () => {
+    const baseNode = createOtherBookmarksNode();
+    const folderNode = createBrowserFolderNode(baseNode);
+    const initialSize = lastVisitTimeMap.size;
+
+    historyManager.handleBookmarkRemoved(folderNode.id);
+
+    expect(lastVisitTimeMap.size).toBe(initialSize);
+  });
+
+  it('ignores separators', () => {
+    const baseNode = createOtherBookmarksNode();
+    const separatorNode = createBrowserSeparatorNode(baseNode);
+    const initialSize = lastVisitTimeMap.size;
+
+    historyManager.handleBookmarkRemoved(separatorNode.id);
+
+    expect(lastVisitTimeMap.size).toBe(initialSize);
+  });
+});
+
+describe('handleBookmarkChanged', () => {
+  it('updates last visit time of a bookmark when its URL is visited', async () => {
+    const baseNode = createOtherBookmarksNode();
+    const bookmarkNode = createBrowserBookmarkNode(baseNode);
+    lastVisitTimeMap.set(bookmarkNode.id, writable(0));
+
+    const newUrl = faker.internet.url();
+    const changeInfo: browser.bookmarks._OnChangedChangeInfo = {
+      title: bookmarkNode.title,
+      url: newUrl,
+    };
+
+    const visitItem = createVisitItem();
+    mockBrowser.history.getVisits
+      .expect({ url: newUrl })
+      .andResolve([visitItem]);
+
+    await historyManager.handleBookmarkChanged(bookmarkNode.id, changeInfo);
+
+    expect(get(lastVisitTimeMap.get(bookmarkNode.id)!)).toBe(
+      visitItem.visitTime!
+    );
+  });
+
+  it('resets last visit time of a bookmark when its URL is not visited', async () => {
+    const baseNode = createOtherBookmarksNode();
+    const bookmarkNode = createBrowserBookmarkNode(baseNode);
+    lastVisitTimeMap.set(bookmarkNode.id, writable(0));
+
+    const newUrl = faker.internet.url();
+    const changeInfo: browser.bookmarks._OnChangedChangeInfo = {
+      title: bookmarkNode.title,
+      url: newUrl,
+    };
+
+    mockBrowser.history.getVisits.expect({ url: newUrl }).andResolve([]);
+
+    await historyManager.handleBookmarkChanged(bookmarkNode.id, changeInfo);
+
+    expect(get(lastVisitTimeMap.get(bookmarkNode.id)!)).toBe(0);
+  });
+
+  it('ignores folders', async () => {
+    const baseNode = createOtherBookmarksNode();
+    const folderNode = createBrowserFolderNode(baseNode);
+    const changeInfo: browser.bookmarks._OnChangedChangeInfo = {
+      title: faker.random.words(),
+    };
+
+    await historyManager.handleBookmarkChanged(folderNode.id, changeInfo);
+  });
+});
+
+describe('handleVisited', () => {
+  it('updates last visit times when the user visits a bookmarked URL', async () => {
+    const historyItem = createHistoryItem();
+    const baseNode = createOtherBookmarksNode();
+    const bookmarkNode1 = createBrowserBookmarkNode(baseNode);
+    const bookmarkNode2 = createBrowserBookmarkNode(baseNode);
+    bookmarkNode1.url = historyItem.url!;
+    bookmarkNode2.url = historyItem.url!;
+    lastVisitTimeMap.set(bookmarkNode1.id, writable(0));
+    lastVisitTimeMap.set(bookmarkNode2.id, writable(0));
+
+    mockBrowser.bookmarks.search
+      .expect({ url: historyItem.url })
+      .andResolve([bookmarkNode1, bookmarkNode2]);
+
+    await historyManager.handleVisited(historyItem);
+
+    expect(get(lastVisitTimeMap.get(bookmarkNode1.id)!)).toBe(
+      historyItem.lastVisitTime!
+    );
+    expect(get(lastVisitTimeMap.get(bookmarkNode2.id)!)).toBe(
+      historyItem.lastVisitTime!
+    );
+  });
+
+  it("ignores visits to URLs that aren't bookmarked", async () => {
+    const historyItem = createHistoryItem();
+    const baseNode = createOtherBookmarksNode();
+    const bookmarkNode1 = createBrowserBookmarkNode(baseNode);
+    const bookmarkNode2 = createBrowserBookmarkNode(baseNode);
+    lastVisitTimeMap.set(bookmarkNode1.id, writable(0));
+    lastVisitTimeMap.set(bookmarkNode2.id, writable(0));
+
+    mockBrowser.bookmarks.search
+      .expect({ url: historyItem.url })
+      .andResolve([]);
+
+    await historyManager.handleVisited(historyItem);
+
+    expect(get(lastVisitTimeMap.get(bookmarkNode1.id)!)).toBe(0);
+    expect(get(lastVisitTimeMap.get(bookmarkNode2.id)!)).toBe(0);
+  });
+});
+
+describe('handleVisitRemoved', () => {
+  it('resets last visit time when a bookmarked URL is removed from history', async () => {
+    const baseNode = createOtherBookmarksNode();
+    const bookmarkNode = createBrowserBookmarkNode(baseNode);
+    lastVisitTimeMap.set(bookmarkNode.id, writable(1e6));
+
+    mockBrowser.bookmarks.search
+      .expect({ url: bookmarkNode.url! })
+      .andResolve([bookmarkNode]);
+
+    const removeInfo: browser.history._OnVisitRemovedRemoved = {
+      allHistory: false,
+      urls: [bookmarkNode.url!],
+    };
+
+    await historyManager.handleVisitRemoved(removeInfo);
+
+    expect(get(lastVisitTimeMap.get(bookmarkNode.id)!)).toBe(0);
+  });
+
+  it('ignores when a non-bookmarked URL is removed from history', async () => {
+    const baseNode = createOtherBookmarksNode();
+    const bookmarkNode = createBrowserBookmarkNode(baseNode);
+    lastVisitTimeMap.set(bookmarkNode.id, writable(1e6));
+
+    const url = faker.internet.url();
+    mockBrowser.bookmarks.search.expect({ url }).andResolve([]);
+
+    const removeInfo: browser.history._OnVisitRemovedRemoved = {
+      allHistory: false,
+      urls: [url],
+    };
+
+    await historyManager.handleVisitRemoved(removeInfo);
+
+    expect(get(lastVisitTimeMap.get(bookmarkNode.id)!)).toBe(1e6);
+  });
+
+  it('resets all last visit times when all history is removed', async () => {
+    const baseNode = createOtherBookmarksNode();
+    const bookmarkNode1 = createBrowserBookmarkNode(baseNode);
+    const bookmarkNode2 = createBrowserBookmarkNode(baseNode);
+    lastVisitTimeMap.set(bookmarkNode1.id, writable(faker.random.number()));
+    lastVisitTimeMap.set(bookmarkNode2.id, writable(faker.random.number()));
+
+    const removeInfo: browser.history._OnVisitRemovedRemoved = {
+      allHistory: true,
+      urls: [],
+    };
+
+    await historyManager.handleVisitRemoved(removeInfo);
+
+    expect(get(lastVisitTimeMap.get(bookmarkNode1.id)!)).toBe(0);
+    expect(get(lastVisitTimeMap.get(bookmarkNode2.id)!)).toBe(0);
+  });
+});
diff --git a/test/treetop/PageFooter.svelte.test.ts b/test/treetop/PageFooter.svelte.test.ts
new file mode 100644
index 0000000..04eb6b0
--- /dev/null
+++ b/test/treetop/PageFooter.svelte.test.ts
@@ -0,0 +1,15 @@
+import { render, screen } from '@testing-library/svelte';
+
+import PageFooter from '@Treetop/treetop/PageFooter.svelte';
+
+const setup = () => {
+  render(PageFooter);
+};
+
+beforeEach(() => {
+  setup();
+});
+
+it('renders page footer', () => {
+  expect(screen.getByRole('separator')).toBeInTheDocument();
+});
diff --git a/test/treetop/PageHeader.svelte.test.ts b/test/treetop/PageHeader.svelte.test.ts
new file mode 100644
index 0000000..63f06a9
--- /dev/null
+++ b/test/treetop/PageHeader.svelte.test.ts
@@ -0,0 +1,38 @@
+import { render, screen } from '@testing-library/svelte';
+import userEvent from '@testing-library/user-event';
+
+import PageHeader from '@Treetop/treetop/PageHeader.svelte';
+
+const setup = () => {
+  render(PageHeader);
+};
+
+beforeEach(() => {
+  mockBrowser.i18n.getMessage.expect('preferences');
+
+  setup();
+});
+
+it('renders page header', () => {
+  expect(screen.getByRole('banner')).toBeInTheDocument();
+  expect(screen.getByRole('button', { hidden: true })).toBeInTheDocument();
+
+  expect(screen.getByRole('banner')).toHaveTextContent('Treetop');
+  expect(screen.getByRole('button', { hidden: true })).toHaveTextContent(
+    'settings'
+  );
+});
+
+it('logo contents', () => {
+  const logo = screen.getByRole('banner');
+  expect(logo).toHaveTextContent('Treetop');
+});
+
+it('preferences button', () => {
+  const button = screen.getByRole('button', { hidden: true });
+  expect(button).toHaveTextContent('settings');
+
+  mockBrowser.runtime.openOptionsPage.expect();
+
+  userEvent.click(button);
+});
diff --git a/test/treetop/PreferencesManager.test.ts b/test/treetop/PreferencesManager.test.ts
new file mode 100644
index 0000000..ec8823c
--- /dev/null
+++ b/test/treetop/PreferencesManager.test.ts
@@ -0,0 +1,140 @@
+import { get, Writable } from 'svelte/store';
+import faker from 'faker';
+
+import { PreferencesManager } from '@Treetop/treetop/PreferencesManager';
+import type * as Treetop from '@Treetop/treetop/types';
+
+let preferencesManager: PreferencesManager;
+
+describe('constructor', () => {
+  it('registers storage event handler', () => {
+    mockBrowser.storage.onChanged.addListener.expect;
+
+    preferencesManager = new PreferencesManager();
+  });
+});
+
+describe('createStore', () => {
+  beforeEach(() => {
+    mockBrowser.storage.onChanged.addListener.expect;
+    preferencesManager = new PreferencesManager();
+  });
+
+  it.each(['value', 2, false, true, ['value'], [2], [false], [true]])(
+    'creates and returns a store for value: %p',
+    (value: Treetop.PreferenceValue) => {
+      const name = faker.random.word();
+      const store = preferencesManager.createStore(name, value);
+
+      expect(get(store)).toBe(value);
+    }
+  );
+});
+
+describe('loadPreferences', () => {
+  let stringStore: Writable<Treetop.PreferenceValue>;
+  let numberStore: Writable<Treetop.PreferenceValue>;
+  let booleanStore: Writable<Treetop.PreferenceValue>;
+  let stringArrayStore: Writable<Treetop.PreferenceValue>;
+  let numberArrayStore: Writable<Treetop.PreferenceValue>;
+  let booleanArrayStore: Writable<Treetop.PreferenceValue>;
+
+  beforeEach(() => {
+    mockBrowser.storage.onChanged.addListener.expect;
+    preferencesManager = new PreferencesManager();
+    stringStore = preferencesManager.createStore('string', 'value');
+    numberStore = preferencesManager.createStore('number', 2);
+    booleanStore = preferencesManager.createStore('boolean', true);
+    stringArrayStore = preferencesManager.createStore('string_array', [
+      'value',
+    ]);
+    numberArrayStore = preferencesManager.createStore('number_array', [2]);
+    booleanArrayStore = preferencesManager.createStore('boolean_array', [true]);
+  });
+
+  it('loads preferences from storage and initializes stores', async () => {
+    const values = {
+      string: 'value2',
+      number: 3,
+      boolean: false,
+      string_array: ['value2'],
+      number_array: [3],
+      boolean_array: [false],
+    };
+    mockBrowser.storage.local.get.expect.andResolve(values);
+
+    await preferencesManager.loadPreferences();
+
+    expect(get(stringStore)).toBe('value2');
+    expect(get(numberStore)).toBe(3);
+    expect(get(booleanStore)).toBe(false);
+    expect(get(stringArrayStore)).toStrictEqual(['value2']);
+    expect(get(numberArrayStore)).toStrictEqual([3]);
+    expect(get(booleanArrayStore)).toStrictEqual([false]);
+  });
+
+  it('ignores preferences from storage without a corresponding store', async () => {
+    const values = { other: true };
+    mockBrowser.storage.local.get.expect.andResolve(values);
+
+    await preferencesManager.loadPreferences();
+  });
+});
+
+describe('handleStoreChanged', () => {
+  let stringStore: Writable<Treetop.PreferenceValue>;
+  let numberStore: Writable<Treetop.PreferenceValue>;
+  let booleanStore: Writable<Treetop.PreferenceValue>;
+  let stringArrayStore: Writable<Treetop.PreferenceValue>;
+  let numberArrayStore: Writable<Treetop.PreferenceValue>;
+  let booleanArrayStore: Writable<Treetop.PreferenceValue>;
+
+  beforeEach(() => {
+    mockBrowser.storage.onChanged.addListener.expect;
+    preferencesManager = new PreferencesManager();
+    stringStore = preferencesManager.createStore('string', 'value');
+    numberStore = preferencesManager.createStore('number', 3);
+    booleanStore = preferencesManager.createStore('boolean', true);
+    stringArrayStore = preferencesManager.createStore('string_array', [
+      'value',
+    ]);
+    numberArrayStore = preferencesManager.createStore('number_array', [2]);
+    booleanArrayStore = preferencesManager.createStore('boolean_array', [true]);
+  });
+
+  it('updates stores when store values change', () => {
+    const changes = {
+      string: {
+        newValue: 'value2',
+      },
+      number: {
+        newValue: 4,
+      },
+      boolean: {
+        newValue: false,
+      },
+      string_array: {
+        newValue: ['value2'],
+      },
+      number_array: {
+        newValue: [3],
+      },
+      boolean_array: {
+        newValue: [false],
+      },
+    };
+    preferencesManager.handleStorageChanged(changes, 'local');
+
+    expect(get(stringStore)).toBe('value2');
+    expect(get(numberStore)).toBe(4);
+    expect(get(booleanStore)).toBe(false);
+    expect(get(stringArrayStore)).toStrictEqual(['value2']);
+    expect(get(numberArrayStore)).toStrictEqual([3]);
+    expect(get(booleanArrayStore)).toStrictEqual([false]);
+  });
+
+  it('ignores store changes without a corresponding store', () => {
+    const changes = { other: { newValue: true } };
+    preferencesManager.handleStorageChanged(changes, 'local');
+  });
+});
diff --git a/test/treetop/Treetop.svelte.test.ts b/test/treetop/Treetop.svelte.test.ts
new file mode 100644
index 0000000..dcc7151
--- /dev/null
+++ b/test/treetop/Treetop.svelte.test.ts
@@ -0,0 +1,97 @@
+import { cleanup, render, screen, waitFor } from '@testing-library/svelte';
+
+import Treetop from '@Treetop/treetop/Treetop.svelte';
+
+import ContextWrapper from '../utils/ContextWrapper.svelte';
+import { createBrowserBookmarksTree } from '../utils/factories';
+
+const setup = () => {
+  render(ContextWrapper, {
+    Component: Treetop,
+    Props: {
+      rootBookmarkId: null,
+    },
+    Context: {},
+  });
+};
+
+describe('Treetop', () => {
+  it('renders', async () => {
+    //
+    // Instantiation
+    //
+
+    // Preferences manager
+    mockBrowser.storage.onChanged.addListener.expect(expect.anything());
+
+    // Delete folder confirmation dialog
+    mockBrowser.i18n.getMessage.expect('dialogHeadingDeleteFolder');
+    mockBrowser.i18n.getMessage.expect('dialogMessageDeleteFolder');
+    mockBrowser.i18n.getMessage.expect('dialogButtonCancel');
+    mockBrowser.i18n.getMessage.expect('dialogButtonDelete');
+
+    // Page header
+    mockBrowser.i18n.getMessage.expect('preferences');
+
+    // Properties dialog
+    mockBrowser.i18n.getMessage.expect('dialogButtonCancel');
+    mockBrowser.i18n.getMessage.expect('dialogButtonSave');
+
+    //
+    // onMount
+    //
+
+    // Menu event handlers
+    mockBrowser.menus.onShown.addListener.expect(expect.anything());
+    mockBrowser.menus.onHidden.addListener.expect(expect.anything());
+    mockBrowser.menus.onClicked.addListener.expect(expect.anything());
+
+    //
+    // init()
+    //
+
+    // Load preferences
+    mockBrowser.storage.local.get.expect.andResolve({});
+
+    // Bookmark event handlers
+    mockBrowser.bookmarks.onCreated.addListener.expect(expect.anything());
+    mockBrowser.bookmarks.onRemoved.addListener.expect(expect.anything());
+    mockBrowser.bookmarks.onChanged.addListener.expect(expect.anything());
+    mockBrowser.bookmarks.onMoved.addListener.expect(expect.anything());
+
+    // History event handlers
+    mockBrowser.history.onVisited.addListener.expect(expect.anything());
+    mockBrowser.history.onVisitRemoved.addListener.expect(expect.anything());
+
+    // Load bookmarks
+    const bookmarksTree = createBrowserBookmarksTree();
+    bookmarksTree[0].title = 'Bookmarks root';
+    mockBrowser.bookmarks.getTree.expect.andResolve(bookmarksTree);
+
+    // Expect all bookmark root folders, excluding Mobile Bookmarks, to be empty
+    const numEmptyFolders = bookmarksTree[0].children!.length - 1;
+    mockBrowser.i18n.getMessage.expect('emptyFolder').times(numEmptyFolders);
+
+    setup();
+
+    expect(screen.getByRole('progressbar')).toBeInTheDocument();
+
+    await waitFor(() => {
+      expect(screen.queryByRole('progressbar')).not.toBeInTheDocument();
+    });
+
+    expect(screen.getByRole('banner')).toBeInTheDocument();
+
+    //
+    // onDestroy
+    //
+
+    mockBrowser.menus.onShown.removeListener.expect(expect.anything());
+    mockBrowser.menus.onHidden.removeListener.expect(expect.anything());
+    mockBrowser.menus.onClicked.removeListener.expect(expect.anything());
+
+    cleanup();
+  });
+});
+
+// TODO: Improve testability of Treetop component
diff --git a/test/treetop/clock.test.ts b/test/treetop/clock.test.ts
new file mode 100644
index 0000000..0b34d1d
--- /dev/null
+++ b/test/treetop/clock.test.ts
@@ -0,0 +1,38 @@
+import { MILLISECONDS_PER_HOUR } from '@Treetop/treetop/clock';
+import type * as Treetop from '@Treetop/treetop/types';
+
+jest.useFakeTimers();
+
+describe('clock', () => {
+  let clockValue: Date;
+  let unsubscribe: Treetop.SvelteStoreUnsubscriber;
+
+  beforeEach(() => {
+    // eslint-disable-next-line
+    const { clock } = require('../../src/treetop/clock');
+    // eslint-disable-next-line
+    unsubscribe = clock.subscribe((value: Date) => {
+      clockValue = value;
+    });
+  });
+
+  afterEach(() => {
+    unsubscribe();
+  });
+
+  it('initializes with current time', () => {
+    const now = new Date();
+    expect(now.getTime()).toBeGreaterThanOrEqual(clockValue.getTime());
+  });
+
+  it('updates every hour', () => {
+    const clockTime1 = clockValue;
+    jest.advanceTimersByTime(MILLISECONDS_PER_HOUR - 1000);
+    const clockTime2 = clockValue;
+    expect(clockTime2).toBe(clockTime1);
+
+    jest.advanceTimersByTime(1000);
+    const clockTime3 = clockValue;
+    expect(clockTime3.getTime()).toBeGreaterThan(clockTime2.getTime());
+  });
+});
diff --git a/test/treetop/menus/DeleteMenuItem.test.ts b/test/treetop/menus/DeleteMenuItem.test.ts
new file mode 100644
index 0000000..df0638c
--- /dev/null
+++ b/test/treetop/menus/DeleteMenuItem.test.ts
@@ -0,0 +1,34 @@
+import faker from 'faker';
+
+import {
+  BOOKMARKS_MENU_GUID,
+  BOOKMARKS_ROOT_GUID,
+  BOOKMARKS_TOOLBAR_GUID,
+  OTHER_BOOKMARKS_GUID,
+} from '@Treetop/treetop/constants';
+import { DeleteMenuItem } from '@Treetop/treetop/menus/DeleteMenuItem';
+import type { OnClickedCallback } from '@Treetop/treetop/menus/MenuItem';
+
+let menuItem: DeleteMenuItem;
+
+beforeEach(() => {
+  const callback: OnClickedCallback = (nodeId) => {
+    void nodeId;
+  };
+
+  menuItem = new DeleteMenuItem(callback);
+});
+
+it.each([
+  BOOKMARKS_MENU_GUID,
+  BOOKMARKS_ROOT_GUID,
+  BOOKMARKS_TOOLBAR_GUID,
+  OTHER_BOOKMARKS_GUID,
+])('is disabled for special bookmark root: %p', (nodeId) => {
+  expect(menuItem.enabled(nodeId)).toBe(false);
+});
+
+it('is enabled for normal bookmark node IDs', () => {
+  const nodeId = faker.random.alphaNumeric(8);
+  expect(menuItem.enabled(nodeId)).toBe(true);
+});
diff --git a/test/treetop/menus/MenuManager.test.ts b/test/treetop/menus/MenuManager.test.ts
new file mode 100644
index 0000000..8606291
--- /dev/null
+++ b/test/treetop/menus/MenuManager.test.ts
@@ -0,0 +1,280 @@
+/* eslint-disable @typescript-eslint/ban-ts-comment */
+
+import faker from 'faker';
+
+import { MenuItem, OnClickedCallback } from '@Treetop/treetop/menus/MenuItem';
+import { MenuManager } from '@Treetop/treetop/menus/MenuManager';
+
+let menuManager: MenuManager;
+
+class TestMenuItem extends MenuItem {
+  constructor(
+    onClickedCallback: OnClickedCallback,
+    private isEnabled: boolean
+  ) {
+    super(onClickedCallback);
+  }
+
+  enabled(nodeId: string): boolean {
+    void nodeId;
+    return this.isEnabled;
+  }
+}
+
+const createOnShownInfo = (origin: string): browser.menus._OnShownInfo => {
+  return {
+    // @ts-expect-error: See https://github.com/jsmnbom/definitelytyped-firefox-webext-browser/pull/37
+    menuIds: [faker.random.number()],
+    contexts: ['link'],
+    viewType: 'tab',
+    editable: true,
+    pageUrl: `${origin}/${faker.random.word()}`,
+    targetElementId: faker.random.number(),
+  };
+};
+
+const createOnClickData = (menuItemId: string): browser.menus.OnClickData => {
+  return {
+    menuItemId,
+    viewType: 'tab',
+    editable: true,
+    bookmarkId: '',
+    modifiers: [],
+    targetElementId: faker.random.number(),
+  };
+};
+
+const createTab = (): browser.tabs.Tab => {
+  return {
+    id: faker.random.number(),
+    index: faker.random.number(),
+    highlighted: false,
+    active: false,
+    pinned: false,
+    incognito: false,
+  };
+};
+
+const createElement = (withNodeId = true) => {
+  return {
+    dataset: {
+      ...(withNodeId && { nodeId: faker.random.alphaNumeric(8) }),
+    },
+  };
+};
+
+beforeEach(() => {
+  menuManager = new MenuManager();
+});
+
+describe('handleMenuShown', () => {
+  let origin: string;
+  let info: browser.menus._OnShownInfo;
+  let tab: browser.tabs.Tab;
+
+  beforeEach(() => {
+    const callback: OnClickedCallback = (nodeId) => {
+      void nodeId;
+    };
+
+    menuManager.registerMenuItem('test1', new TestMenuItem(callback, true));
+    menuManager.registerMenuItem('test2', new TestMenuItem(callback, false));
+
+    origin = faker.internet.url();
+    info = createOnShownInfo(origin);
+    tab = createTab();
+  });
+
+  it('updates whether menu items are enabled', async () => {
+    const element = createElement();
+    mockBrowser.runtime.getURL.expect('').andReturn(origin);
+    mockBrowser.tabs.getCurrent.expect.andResolve(tab);
+    mockBrowser.menus.getTargetElement
+      .expect(info.targetElementId!)
+      // @ts-ignore
+      .andReturn(element);
+    mockBrowser.menus.update.expect('test1', { enabled: true });
+    mockBrowser.menus.update.expect('test2', { enabled: false });
+    mockBrowser.menus.refresh.expect;
+
+    await menuManager.handleMenuShown(info, tab);
+  });
+
+  it("no-op if context is not 'link'", async () => {
+    info.contexts = ['page'];
+
+    await menuManager.handleMenuShown(info, tab);
+  });
+
+  it("no-op if viewType is not 'tab'", async () => {
+    info.viewType = 'popup';
+
+    await menuManager.handleMenuShown(info, tab);
+  });
+
+  it("no-op if pageUrl isn't provided", async () => {
+    delete info.pageUrl;
+
+    mockBrowser.runtime.getURL.expect('').andReturn(origin);
+
+    await menuManager.handleMenuShown(info, tab);
+  });
+
+  it("no-op if pageUrl doesn't match", async () => {
+    info.pageUrl = faker.internet.url();
+
+    mockBrowser.runtime.getURL.expect('').andReturn(origin);
+
+    await menuManager.handleMenuShown(info, tab);
+  });
+
+  it('no-op if not in current tab', async () => {
+    mockBrowser.runtime.getURL.expect('').andReturn(origin);
+
+    const otherTab = createTab();
+    mockBrowser.tabs.getCurrent.expect.andResolve(otherTab);
+
+    await menuManager.handleMenuShown(info, tab);
+  });
+
+  it("no-op if targetElementId isn't provided", async () => {
+    delete info.targetElementId;
+
+    mockBrowser.runtime.getURL.expect('').andReturn(origin);
+    mockBrowser.tabs.getCurrent.expect.andResolve(tab);
+
+    await menuManager.handleMenuShown(info, tab);
+  });
+
+  it("no-op if nodeId isn't available", async () => {
+    const element = createElement(false);
+
+    mockBrowser.runtime.getURL.expect('').andReturn(origin);
+    mockBrowser.tabs.getCurrent.expect.andResolve(tab);
+    mockBrowser.menus.getTargetElement
+      .expect(info.targetElementId!)
+      // @ts-ignore
+      .andReturn(element);
+
+    await menuManager.handleMenuShown(info, tab);
+  });
+});
+
+describe('handleMenuShown', () => {
+  it('succeeds', () => {
+    menuManager.handleMenuHidden();
+  });
+});
+
+describe('handleMenuClicked', () => {
+  let info: browser.menus.OnClickData;
+  let tab: browser.tabs.Tab;
+  let test1Clicked: boolean;
+  let test2Clicked: boolean;
+  let clickedNodeId: string | null;
+
+  beforeEach(() => {
+    test1Clicked = false;
+    test2Clicked = false;
+    clickedNodeId = null;
+
+    const callback1: OnClickedCallback = (nodeId) => {
+      test1Clicked = true;
+      clickedNodeId = nodeId;
+    };
+
+    const callback2: OnClickedCallback = (nodeId) => {
+      test2Clicked = true;
+      clickedNodeId = nodeId;
+    };
+
+    menuManager.registerMenuItem('test1', new TestMenuItem(callback1, true));
+    menuManager.registerMenuItem('test2', new TestMenuItem(callback2, false));
+
+    info = createOnClickData('test1');
+    tab = createTab();
+  });
+
+  it('calls a registered menu item handler', async () => {
+    const element = createElement();
+    mockBrowser.tabs.getCurrent.expect.andResolve(tab);
+    mockBrowser.menus.getTargetElement
+      .expect(info.targetElementId!)
+      // @ts-ignore
+      .andReturn(element);
+
+    await menuManager.handleMenuClicked(info, tab);
+
+    expect(test1Clicked).toBe(true);
+    expect(test2Clicked).toBe(false);
+    expect(clickedNodeId).toBe(element.dataset.nodeId);
+  });
+
+  it("no-op if viewType is not 'tab'", async () => {
+    info.viewType = 'popup';
+
+    await menuManager.handleMenuClicked(info, tab);
+
+    expect(test1Clicked).toBe(false);
+    expect(test2Clicked).toBe(false);
+  });
+
+  it('no-op if tab is not provided', async () => {
+    await menuManager.handleMenuClicked(info);
+
+    expect(test1Clicked).toBe(false);
+    expect(test2Clicked).toBe(false);
+  });
+
+  it('no-op if not in current tab', async () => {
+    const otherTab = createTab();
+    mockBrowser.tabs.getCurrent.expect.andResolve(otherTab);
+
+    await menuManager.handleMenuClicked(info, tab);
+
+    expect(test1Clicked).toBe(false);
+    expect(test2Clicked).toBe(false);
+  });
+
+  it("no-op if targetElementId isn't provided", async () => {
+    delete info.targetElementId;
+
+    mockBrowser.tabs.getCurrent.expect.andResolve(tab);
+
+    await menuManager.handleMenuClicked(info, tab);
+
+    expect(test1Clicked).toBe(false);
+    expect(test2Clicked).toBe(false);
+  });
+
+  it("no-op if nodeId isn't available", async () => {
+    const element = createElement(false);
+
+    mockBrowser.tabs.getCurrent.expect.andResolve(tab);
+    mockBrowser.menus.getTargetElement
+      .expect(info.targetElementId!)
+      // @ts-ignore
+      .andReturn(element);
+
+    await menuManager.handleMenuClicked(info, tab);
+
+    expect(test1Clicked).toBe(false);
+    expect(test2Clicked).toBe(false);
+  });
+
+  it("no-op if menuItemId isn't registered", async () => {
+    const element = createElement();
+    info.menuItemId = 'other';
+
+    mockBrowser.tabs.getCurrent.expect.andResolve(tab);
+    mockBrowser.menus.getTargetElement
+      .expect(info.targetElementId!)
+      // @ts-ignore
+      .andReturn(element);
+
+    await menuManager.handleMenuClicked(info, tab);
+
+    expect(test1Clicked).toBe(false);
+    expect(test2Clicked).toBe(false);
+  });
+});
diff --git a/test/treetop/menus/OpenAllInTabsMenuItem.test.ts b/test/treetop/menus/OpenAllInTabsMenuItem.test.ts
new file mode 100644
index 0000000..b47fefd
--- /dev/null
+++ b/test/treetop/menus/OpenAllInTabsMenuItem.test.ts
@@ -0,0 +1,51 @@
+import { writable } from 'svelte/store';
+import faker from 'faker';
+
+import { BOOKMARKS_ROOT_GUID } from '@Treetop/treetop/constants';
+import type { OnClickedCallback } from '@Treetop/treetop/menus/MenuItem';
+import { OpenAllInTabsMenuItem } from '@Treetop/treetop/menus/OpenAllInTabsMenuItem';
+import type * as Treetop from '@Treetop/treetop/types';
+
+import { createBookmarkNode, createFolderNode } from '../../utils/factories';
+
+let menuItem: OpenAllInTabsMenuItem;
+let nodeStoreMap: Treetop.NodeStoreMap;
+
+beforeEach(() => {
+  nodeStoreMap = new Map() as Treetop.NodeStoreMap;
+
+  const callback: OnClickedCallback = (nodeId) => {
+    void nodeId;
+  };
+
+  menuItem = new OpenAllInTabsMenuItem(nodeStoreMap, callback);
+});
+
+it('is disabled for the bookmarks root', () => {
+  expect(menuItem.enabled(BOOKMARKS_ROOT_GUID)).toBe(false);
+});
+
+it('is disabled for bookmarks', () => {
+  const nodeId = faker.random.alphaNumeric(8);
+  expect(menuItem.enabled(nodeId)).toBe(false);
+});
+
+describe('folders', () => {
+  let folderNode: Treetop.FolderNode;
+
+  beforeEach(() => {
+    folderNode = createFolderNode();
+    nodeStoreMap.set(folderNode.id, writable(folderNode));
+  });
+
+  it('is disabled for empty folder', () => {
+    expect(folderNode.children.length).toBe(0);
+    expect(menuItem.enabled(folderNode.id)).toBe(false);
+  });
+
+  it('is enabled for non-empty folder', () => {
+    expect(folderNode.children.length).toBe(0);
+    folderNode.children.push(createBookmarkNode());
+    expect(menuItem.enabled(folderNode.id)).toBe(true);
+  });
+});
diff --git a/test/treetop/menus/PropertiesMenuItem.test.ts b/test/treetop/menus/PropertiesMenuItem.test.ts
new file mode 100644
index 0000000..53e11de
--- /dev/null
+++ b/test/treetop/menus/PropertiesMenuItem.test.ts
@@ -0,0 +1,34 @@
+import faker from 'faker';
+
+import {
+  BOOKMARKS_MENU_GUID,
+  BOOKMARKS_ROOT_GUID,
+  BOOKMARKS_TOOLBAR_GUID,
+  OTHER_BOOKMARKS_GUID,
+} from '@Treetop/treetop/constants';
+import type { OnClickedCallback } from '@Treetop/treetop/menus/MenuItem';
+import { PropertiesMenuItem } from '@Treetop/treetop/menus/PropertiesMenuItem';
+
+let menuItem: PropertiesMenuItem;
+
+beforeEach(() => {
+  const callback: OnClickedCallback = (nodeId) => {
+    void nodeId;
+  };
+
+  menuItem = new PropertiesMenuItem(callback);
+});
+
+it.each([
+  BOOKMARKS_MENU_GUID,
+  BOOKMARKS_ROOT_GUID,
+  BOOKMARKS_TOOLBAR_GUID,
+  OTHER_BOOKMARKS_GUID,
+])('is disabled for special bookmark root: %p', (nodeId) => {
+  expect(menuItem.enabled(nodeId)).toBe(false);
+});
+
+it('is enabled for normal bookmark node IDs', () => {
+  const nodeId = faker.random.alphaNumeric(8);
+  expect(menuItem.enabled(nodeId)).toBe(true);
+});
diff --git a/test/treetop/utils.test.ts b/test/treetop/utils.test.ts
new file mode 100644
index 0000000..c0e9a4b
--- /dev/null
+++ b/test/treetop/utils.test.ts
@@ -0,0 +1,36 @@
+import { truncateMiddle } from '@Treetop/treetop/utils';
+
+describe('truncateMiddle', () => {
+  it.each([
+    ['', 1],
+    ['', 5],
+    ['a', 1],
+    ['a', 5],
+    ['ab', 2],
+    ['ab', 5],
+    ['abc', 5],
+    ['abc', 10],
+    ['abcd', 5],
+    ['abcd', 10],
+    ['abcde', 5],
+    ['abcde', 10],
+  ])(
+    'returns unmodified string if length is less than or equal to max. length: %p/%i',
+    (str, maxLength) => {
+      expect(truncateMiddle(str, maxLength)).toBe(str);
+    }
+  );
+
+  it.each`
+    str             | maxLength | expected
+    ${'0123456789'} | ${6}      | ${'012...89'}
+    ${'0123456789'} | ${7}      | ${'0123...89'}
+    ${'0123456789'} | ${8}      | ${'0123...789'}
+    ${'0123456789'} | ${9}      | ${'01234...789'}
+  `(
+    'returns $expected for $str with max. length $maxLength',
+    ({ str, maxLength, expected }) => {
+      expect(truncateMiddle(str, maxLength)).toBe(expected);
+    }
+  );
+});
diff --git a/test/utils/ContextWrapper.svelte b/test/utils/ContextWrapper.svelte
new file mode 100644
index 0000000..7406e35
--- /dev/null
+++ b/test/utils/ContextWrapper.svelte
@@ -0,0 +1,17 @@
+<script lang="ts">
+  // Wrapper component to test Svelte components that use the Context API.
+  // See https://github.com/svelte-society/recipes-mvp/blob/master/testing.md#testing-the-context-api
+  import { setContext, SvelteComponent } from 'svelte';
+
+  // Component
+  export let Component: SvelteComponent;
+  export let Props: Record<string, any>;
+
+  // Context
+  export let Context: Record<string, any>;
+  for (const [key, value] of Object.entries(Context)) {
+    setContext(key, value);
+  }
+</script>
+
+<svelte:component this={Component} {...Props} />
diff --git a/test/utils/factories.ts b/test/utils/factories.ts
new file mode 100644
index 0000000..6f07b3b
--- /dev/null
+++ b/test/utils/factories.ts
@@ -0,0 +1,171 @@
+import faker from 'faker';
+
+import {
+  BOOKMARK_TREE_NODE_TYPE_BOOKMARK,
+  BOOKMARK_TREE_NODE_TYPE_FOLDER,
+  BOOKMARK_TREE_NODE_TYPE_SEPARATOR,
+  BOOKMARKS_MENU_GUID,
+  BOOKMARKS_ROOT_GUID,
+  BOOKMARKS_TOOLBAR_GUID,
+  MOBILE_BOOKMARKS_GUID,
+  OTHER_BOOKMARKS_GUID,
+} from '@Treetop/treetop/constants';
+import * as Treetop from '@Treetop/treetop/types';
+
+//
+// Treetop node factories
+//
+
+export const createBookmarkNode = (): Treetop.BookmarkNode => {
+  return {
+    id: faker.random.uuid(),
+    type: Treetop.NodeType.Bookmark,
+    title: faker.random.words(),
+    url: faker.internet.url(),
+  };
+};
+
+export const createFolderNode = (): Treetop.FolderNode => {
+  return {
+    id: faker.random.uuid(),
+    type: Treetop.NodeType.Folder,
+    title: faker.random.words(),
+    children: [],
+  };
+};
+
+export const createSeparatorNode = (): Treetop.SeparatorNode => {
+  return {
+    id: faker.random.uuid(),
+    type: Treetop.NodeType.Separator,
+  };
+};
+
+//
+// Browser bookmark factories
+//
+
+export const createBrowserBookmarkNode = (
+  parent: browser.bookmarks.BookmarkTreeNode
+): browser.bookmarks.BookmarkTreeNode => {
+  const node: browser.bookmarks.BookmarkTreeNode = {
+    id: faker.random.uuid(),
+    parentId: parent.id,
+    title: faker.random.words(),
+    type: BOOKMARK_TREE_NODE_TYPE_BOOKMARK,
+    url: faker.internet.url(),
+  };
+  parent.children!.push(node);
+  return node;
+};
+
+export const createBrowserFolderNode = (
+  parent: browser.bookmarks.BookmarkTreeNode
+): browser.bookmarks.BookmarkTreeNode => {
+  const node: browser.bookmarks.BookmarkTreeNode = {
+    id: faker.random.uuid(),
+    parentId: parent.id,
+    title: faker.random.words(),
+    type: BOOKMARK_TREE_NODE_TYPE_FOLDER,
+    children: [],
+  };
+  parent.children!.push(node);
+  return node;
+};
+
+export const createBrowserSeparatorNode = (
+  parent: browser.bookmarks.BookmarkTreeNode
+): browser.bookmarks.BookmarkTreeNode => {
+  const node: browser.bookmarks.BookmarkTreeNode = {
+    id: faker.random.uuid(),
+    parentId: parent.id,
+    title: '',
+    type: BOOKMARK_TREE_NODE_TYPE_SEPARATOR,
+    url: '',
+  };
+  parent.children!.push(node);
+  return node;
+};
+
+export const createBookmarksMenuNode = (): browser.bookmarks.BookmarkTreeNode => {
+  return {
+    id: BOOKMARKS_MENU_GUID,
+    parentId: BOOKMARKS_ROOT_GUID,
+    title: 'Bookmarks Menu',
+    type: BOOKMARK_TREE_NODE_TYPE_FOLDER,
+    children: [],
+  };
+};
+
+export const createBookmarksToolbarNode = (): browser.bookmarks.BookmarkTreeNode => {
+  return {
+    id: BOOKMARKS_TOOLBAR_GUID,
+    parentId: BOOKMARKS_ROOT_GUID,
+    title: 'Bookmarks Toolbar',
+    type: BOOKMARK_TREE_NODE_TYPE_FOLDER,
+    children: [],
+  };
+};
+
+export const createOtherBookmarksNode = (): browser.bookmarks.BookmarkTreeNode => {
+  return {
+    id: OTHER_BOOKMARKS_GUID,
+    parentId: BOOKMARKS_ROOT_GUID,
+    title: 'Other Bookmarks',
+    type: BOOKMARK_TREE_NODE_TYPE_FOLDER,
+    children: [],
+  };
+};
+
+export const createMobileBookmarksNode = (): browser.bookmarks.BookmarkTreeNode => {
+  return {
+    id: MOBILE_BOOKMARKS_GUID,
+    parentId: BOOKMARKS_ROOT_GUID,
+    title: 'Mobile Bookmarks',
+    type: BOOKMARK_TREE_NODE_TYPE_FOLDER,
+    children: [],
+  };
+};
+
+export const createBookmarksRootNode = (): browser.bookmarks.BookmarkTreeNode => {
+  return {
+    id: BOOKMARKS_ROOT_GUID,
+    parentId: undefined,
+    url: undefined,
+    type: BOOKMARK_TREE_NODE_TYPE_FOLDER,
+    title: '',
+    children: [
+      createBookmarksMenuNode(),
+      createBookmarksToolbarNode(),
+      createOtherBookmarksNode(),
+      createMobileBookmarksNode(),
+    ],
+  };
+};
+
+export const createBrowserBookmarksTree = (): browser.bookmarks.BookmarkTreeNode[] => {
+  const rootNode = createBookmarksRootNode();
+  return [rootNode];
+};
+
+//
+// Browser history factories
+//
+
+export const createHistoryItem = (): browser.history.HistoryItem => {
+  return {
+    id: faker.random.uuid(),
+    url: faker.internet.url(),
+    lastVisitTime: faker.random.number(),
+  };
+};
+
+export const createVisitItem = (): browser.history.VisitItem => {
+  return {
+    id: faker.random.uuid(),
+    visitId: faker.random.uuid(),
+    visitTime: faker.random.number(),
+    referringVisitId: faker.random.uuid(),
+    transition: 'link',
+  };
+};
diff --git a/test/welcome/Welcome.svelte.test.ts b/test/welcome/Welcome.svelte.test.ts
new file mode 100644
index 0000000..d58c9af
--- /dev/null
+++ b/test/welcome/Welcome.svelte.test.ts
@@ -0,0 +1,23 @@
+import { render, screen } from '@testing-library/svelte';
+
+import Welcome from '@Treetop/welcome/Welcome.svelte';
+
+const setup = () => {
+  render(Welcome);
+};
+
+beforeEach(() => {
+  setup();
+});
+
+it('renders welcome page', () => {
+  expect(screen.getByRole('banner')).toBeInTheDocument();
+  expect(screen.getByText(/thanks for installing/i)).toBeInTheDocument();
+  expect(screen.getByText(/getting started/i)).toBeInTheDocument();
+  expect(
+    screen.getByText(/open treetop by clicking its icon/i)
+  ).toBeInTheDocument();
+  expect(
+    screen.getByText(/treetop shows all your bookmarks on a single page/i)
+  ).toBeInTheDocument();
+});
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..7e659ee
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,39 @@
+{
+  "extends": "@tsconfig/svelte/tsconfig.json",
+  "compilerOptions": {
+    "baseUrl": "./src",
+    "paths": {
+      "@Treetop/*": [
+        "*"
+      ],
+    },
+    "allowJs": true,
+    "allowSyntheticDefaultImports": true,
+    "checkJs": true,
+    "strict": true,
+    "noEmitOnError": true,
+    "noImplicitAny": true,
+    "noImplicitReturns": true,
+    "noImplicitThis": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "typeRoots": [
+      "./node_modules/@types",
+      "./src/types"
+    ],
+    "types": [
+      "jest",
+      "firefox-webext-browser",
+      "mockzilla-webextension",
+      "@testing-library/jest-dom",
+    ]
+  },
+  "include": [
+    "./src/**/*",
+    "./test/**/*",
+  ],
+  "exclude": [
+    "node_modules/*"
+  ]
+}