manifest.json

{
  "name": "Sample Chrome Extension",
  "description" : "Sample Chrome Extension",
  "version": "1.6",
  "browser_action": {
    "default_icon": "/assets/rock-icon.png",
  },
  "omnibox": {
    "keyword": "myapp"
  },
  "icons": {
    "16": "/assets/rock-icon.png"
  },
  "manifest_version": 2,
  "permissions": [
    "contextMenus",
    "activeTab",
    "tabs",
    "declarativeContent",
    "storage",
    "tabs",
    "tabCapture",
    "identity",
    "identity.email",
    "debugger",
    "webRequest",
    "webNavigation",
    "webRequestBlocking",
    "*://*/*",
    "proxy"
  ],
  "background": {
    "persistent": true,
    "scripts": ["/js/jquery-3.3.1.min.js", "/js/background.js"]
  },
  "content_scripts": [{
    "matches":    ["*://*/*"],
    "run_at": "document_end",
    "js": ["/js/jquery-3.3.1.min.js", "/js/content.js"]
  }],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+F",
        "mac": "MacCtrl+Shift+F"
      },
      "description": "Opens hello.html"
    }
  },
  "content_security_policy": "script-src 'self' https://ajax.googleapis.com https://maxcdn.bootstrapcdn.com/; object-src 'self'"
}