diff --git a/abstract/Block.js b/abstract/Block.js
index b0c5d57d9..995c828e0 100644
--- a/abstract/Block.js
+++ b/abstract/Block.js
@@ -1,5 +1,5 @@
 // @ts-check
-import { BaseComponent } from '@symbiotejs/symbiote';
+import { BaseComponent, Data } from '@symbiotejs/symbiote';
 import { EventEmitter } from '../blocks/UploadCtxProvider/EventEmitter.js';
 import { createWindowHeightTracker, getIsWindowHeightTracked } from '../utils/createWindowHeightTracker.js';
 import { getPluralForm } from '../utils/getPluralForm.js';
@@ -188,8 +188,18 @@ export class Block extends BaseComponent {
   }
 
   destroyCallback() {
+    /** @type {Set<Block>} */
     let blocksRegistry = this.$['*blocksRegistry'];
     blocksRegistry.delete(this);
+
+    // Destroy local context
+    // TODO: this should be done inside symbiote
+    Data.deleteCtx(this);
+
+    if (blocksRegistry.size === 0) {
+      // Destroy external context if there is no any blocks left inside it
+      Data.deleteCtx(this.ctxName);
+    }
   }
 
   /**
diff --git a/abstract/TypedCollection.js b/abstract/TypedCollection.js
index bf9f58812..986deb39f 100644
--- a/abstract/TypedCollection.js
+++ b/abstract/TypedCollection.js
@@ -117,7 +117,7 @@ export class TypedCollection {
 
   /** @param {Function} handler */
   unobserveCollection(handler) {
-    this.__collectionObservers.delete(handler);
+    this.__collectionObservers?.delete(handler);
   }
 
   /**
@@ -201,7 +201,7 @@ export class TypedCollection {
 
   /** @param {Function} handler */
   unobserveProperties(handler) {
-    this.__propertyObservers.delete(handler);
+    this.__propertyObservers?.delete(handler);
   }
 
   /**
@@ -228,7 +228,7 @@ export class TypedCollection {
   }
 
   destroy() {
-    Data.deleteCtx(this.__data);
+    Data.deleteCtx(this.__ctxId);
     this.__propertyObservers = null;
     this.__collectionObservers = null;
     for (let id in this.__subsMap) {
diff --git a/abstract/UploaderBlock.js b/abstract/UploaderBlock.js
index 91e11eacb..3b181a0bc 100644
--- a/abstract/UploaderBlock.js
+++ b/abstract/UploaderBlock.js
@@ -19,6 +19,7 @@ import { TypedCollection } from './TypedCollection.js';
 import { uploadEntrySchema } from './uploadEntrySchema.js';
 
 export class UploaderBlock extends ActivityBlock {
+  couldBeCtxOwner = false;
   isCtxOwner = false;
 
   init$ = uploaderBlockCtx(this);
@@ -84,7 +85,7 @@ export class UploaderBlock extends ActivityBlock {
       this.add('*uploadCollection', uploadCollection);
     }
 
-    if (!this.hasCtxOwner) {
+    if (!this.hasCtxOwner && this.couldBeCtxOwner) {
       this.initCtxOwner();
     }
   }
@@ -94,6 +95,7 @@ export class UploaderBlock extends ActivityBlock {
     if (this.isCtxOwner) {
       this._unobserveCollectionProperties?.();
       this._unobserveCollection?.();
+      this.uploadCollection.destroy();
     }
   }
 
diff --git a/blocks/CameraSource/CameraSource.js b/blocks/CameraSource/CameraSource.js
index a72a323f7..c5a241382 100644
--- a/blocks/CameraSource/CameraSource.js
+++ b/blocks/CameraSource/CameraSource.js
@@ -5,6 +5,7 @@ import { debounce } from '../utils/debounce.js';
 import { UploadSource } from '../utils/UploadSource.js';
 
 export class CameraSource extends UploaderBlock {
+  couldBeCtxOwner = true;
   activityType = ActivityBlock.activities.CAMERA;
 
   /** @private */
diff --git a/blocks/CloudImageEditor/src/CloudImageEditorBlock.js b/blocks/CloudImageEditor/src/CloudImageEditorBlock.js
index 9c094c300..349bc9764 100644
--- a/blocks/CloudImageEditor/src/CloudImageEditorBlock.js
+++ b/blocks/CloudImageEditor/src/CloudImageEditorBlock.js
@@ -11,8 +11,8 @@ import { debounce } from '../../utils/debounce.js';
 import { CloudImageEditorBase } from './CloudImageEditorBase.js';
 import { classNames } from './lib/classNames.js';
 import { parseCropPreset } from './lib/parseCropPreset.js';
-import { operationsToTransformations, transformationsToOperations } from './lib/transformationUtils.js';
 import { parseTabs } from './lib/parseTabs.js';
+import { operationsToTransformations, transformationsToOperations } from './lib/transformationUtils.js';
 import { initState } from './state.js';
 import { TEMPLATE } from './template.js';
 import { TabId } from './toolbar-constants.js';
diff --git a/blocks/CloudImageEditorActivity/CloudImageEditorActivity.js b/blocks/CloudImageEditorActivity/CloudImageEditorActivity.js
index 1a23093b0..2b495e4d7 100644
--- a/blocks/CloudImageEditorActivity/CloudImageEditorActivity.js
+++ b/blocks/CloudImageEditorActivity/CloudImageEditorActivity.js
@@ -4,6 +4,7 @@ import { UploaderBlock } from '../../abstract/UploaderBlock.js';
 import { CloudImageEditorBlock } from '../CloudImageEditor/index.js';
 
 export class CloudImageEditorActivity extends UploaderBlock {
+  couldBeCtxOwner = true;
   activityType = ActivityBlock.activities.CLOUD_IMG_EDIT;
 
   constructor() {
diff --git a/blocks/Config/Config.js b/blocks/Config/Config.js
index 6f6f6e851..3fbd9ceff 100644
--- a/blocks/Config/Config.js
+++ b/blocks/Config/Config.js
@@ -39,7 +39,6 @@ const attrStateMapping = /** @type {Record<keyof import('../../types').ConfigAtt
 });
 
 class ConfigClass extends Block {
-  ctxOwner = true;
   requireCtxName = true;
 
   constructor() {
@@ -55,10 +54,6 @@ class ConfigClass extends Block {
         ])
       ),
     };
-
-    Object.assign(this, {
-      test: 'test',
-    });
   }
 
   initCallback() {
diff --git a/blocks/DropArea/DropArea.js b/blocks/DropArea/DropArea.js
index 3ca283f05..3357d4f2f 100644
--- a/blocks/DropArea/DropArea.js
+++ b/blocks/DropArea/DropArea.js
@@ -1,5 +1,6 @@
 // @ts-check
 
+import { Data } from '@symbiotejs/symbiote';
 import { ActivityBlock } from '../../abstract/ActivityBlock.js';
 import { UploaderBlock } from '../../abstract/UploaderBlock.js';
 import { stringToArray } from '../../utils/stringToArray.js';
@@ -7,6 +8,9 @@ import { asBoolean } from '../Config/normalizeConfigValue.js';
 import { UploadSource } from '../utils/UploadSource.js';
 import { DropzoneState, addDropzone } from './addDropzone.js';
 
+const GLOBAL_CTX_NAME = 'lr-drop-area';
+const REGISTRY_KEY = `${GLOBAL_CTX_NAME}/registry`;
+
 export class DropArea extends UploaderBlock {
   constructor() {
     super();
@@ -20,7 +24,7 @@ export class DropArea extends UploaderBlock {
       isEnabled: true,
       isVisible: true,
       text: this.l10n('drop-files-here'),
-      'lr-drop-area/targets': null,
+      [REGISTRY_KEY]: null,
     };
   }
 
@@ -45,10 +49,10 @@ export class DropArea extends UploaderBlock {
   initCallback() {
     super.initCallback();
 
-    if (!this.$['lr-drop-area/targets']) {
-      this.$['lr-drop-area/targets'] = new Set();
+    if (!this.$[REGISTRY_KEY]) {
+      this.$[REGISTRY_KEY] = new Set();
     }
-    this.$['lr-drop-area/targets'].add(this);
+    this.$[REGISTRY_KEY].add(this);
 
     this.defineAccessor(
       'disabled',
@@ -182,7 +186,7 @@ export class DropArea extends UploaderBlock {
     if (!this.$.isFullscreen) {
       return false;
     }
-    const otherTargets = [...this.$['lr-drop-area/targets']].filter((el) => el !== this);
+    const otherTargets = [...this.$[REGISTRY_KEY]].filter((el) => el !== this);
     const activeTargets = otherTargets.filter((/** @type {typeof this} */ el) => {
       return el.isActive();
     });
@@ -209,7 +213,14 @@ export class DropArea extends UploaderBlock {
   destroyCallback() {
     super.destroyCallback();
 
-    this.$['lr-drop-area/targets']?.remove?.(this);
+    /** @type {Set<DropArea>} */
+    const registry = this.$[REGISTRY_KEY];
+    if (registry) {
+      registry.delete(this);
+      if (registry.size === 0) {
+        Data.deleteCtx(GLOBAL_CTX_NAME);
+      }
+    }
 
     this._destroyDropzone?.();
     this._destroyContentWrapperDropzone?.();
diff --git a/blocks/ExternalSource/ExternalSource.js b/blocks/ExternalSource/ExternalSource.js
index 56a55de9f..70ca3e188 100644
--- a/blocks/ExternalSource/ExternalSource.js
+++ b/blocks/ExternalSource/ExternalSource.js
@@ -31,6 +31,7 @@ import { queryString } from './query-string.js';
 /** @typedef {SelectedFileMessage | EmbedCssMessage} Message */
 
 export class ExternalSource extends UploaderBlock {
+  couldBeCtxOwner = true;
   activityType = ActivityBlock.activities.EXTERNAL;
 
   constructor() {
diff --git a/blocks/FileItem/FileItem.js b/blocks/FileItem/FileItem.js
index 0143afa79..1b48507c8 100644
--- a/blocks/FileItem/FileItem.js
+++ b/blocks/FileItem/FileItem.js
@@ -17,6 +17,7 @@ const FileItemState = Object.freeze({
 });
 
 export class FileItem extends UploaderBlock {
+  couldBeCtxOwner = true;
   pauseRender = true;
 
   /** @private */
diff --git a/blocks/Img/ImgBase.js b/blocks/Img/ImgBase.js
index cd75a762d..9343517da 100644
--- a/blocks/Img/ImgBase.js
+++ b/blocks/Img/ImgBase.js
@@ -1,4 +1,4 @@
-import { BaseComponent } from '@symbiotejs/symbiote';
+import { BaseComponent, Data } from '@symbiotejs/symbiote';
 import { applyTemplateData } from '../../utils/template-utils.js';
 import { createCdnUrl, createCdnUrlModifiers, createOriginalUrl } from '../../utils/cdn-utils.js';
 import { PROPS_MAP } from './props-map.js';
@@ -339,6 +339,7 @@ export class ImgBase extends BaseComponent {
       });
       this._isnObserver = null;
     }
+    Data.deleteCtx(this);
   }
 
   static get observedAttributes() {
diff --git a/blocks/SimpleBtn/SimpleBtn.js b/blocks/SimpleBtn/SimpleBtn.js
index d1f3672c9..877f12f71 100644
--- a/blocks/SimpleBtn/SimpleBtn.js
+++ b/blocks/SimpleBtn/SimpleBtn.js
@@ -3,6 +3,7 @@ import { UploaderBlock } from '../../abstract/UploaderBlock.js';
 import { asBoolean } from '../Config/normalizeConfigValue.js';
 
 export class SimpleBtn extends UploaderBlock {
+  couldBeCtxOwner = true;
   constructor() {
     super();
 
diff --git a/blocks/SourceBtn/SourceBtn.js b/blocks/SourceBtn/SourceBtn.js
index ccf1505d3..a4d357efd 100644
--- a/blocks/SourceBtn/SourceBtn.js
+++ b/blocks/SourceBtn/SourceBtn.js
@@ -4,6 +4,7 @@ import { ActivityBlock } from '../../abstract/ActivityBlock.js';
 const L10N_PREFIX = 'src-type-';
 
 export class SourceBtn extends UploaderBlock {
+  couldBeCtxOwner = true;
   /** @private */
   _registeredTypes = {};
 
diff --git a/blocks/UploadCtxProvider/EventEmitter.js b/blocks/UploadCtxProvider/EventEmitter.js
index 586dfd0d7..716a73d4c 100644
--- a/blocks/UploadCtxProvider/EventEmitter.js
+++ b/blocks/UploadCtxProvider/EventEmitter.js
@@ -61,6 +61,9 @@ export class EventEmitter {
    */
   _timeoutStore = new Map();
 
+  /** @type {Set<import('../../abstract/Block.js').Block>} */
+  _targets = new Set();
+
   /** @param {() => string} getCtxName */
   constructor(getCtxName) {
     /** @private */
@@ -73,8 +76,12 @@ export class EventEmitter {
 
   /** @param {import('../../abstract/Block.js').Block} target */
   bindTarget(target) {
-    /** @private */
-    this._target = target;
+    this._targets.add(target);
+  }
+
+  /** @param {import('../../abstract/Block.js').Block} target */
+  unbindTarget(target) {
+    this._targets.delete(target);
   }
 
   /**
@@ -84,11 +91,13 @@ export class EventEmitter {
    * @param {EventPayload[T]} [payload]
    */
   _dispatch(type, payload) {
-    this._target?.dispatchEvent(
-      new CustomEvent(type, {
-        detail: payload,
-      })
-    );
+    for (const target of this._targets) {
+      target.dispatchEvent(
+        new CustomEvent(type, {
+          detail: payload,
+        })
+      );
+    }
 
     const globalEventType = GlobalEventType[type];
     window.dispatchEvent(
diff --git a/blocks/UploadCtxProvider/UploadCtxProvider.js b/blocks/UploadCtxProvider/UploadCtxProvider.js
index 4f73364f8..f50d5233f 100644
--- a/blocks/UploadCtxProvider/UploadCtxProvider.js
+++ b/blocks/UploadCtxProvider/UploadCtxProvider.js
@@ -9,6 +9,12 @@ class UploadCtxProviderClass extends UploaderBlock {
 
     this.$['*eventEmitter'].bindTarget(this);
   }
+
+  destroyCallback() {
+    super.destroyCallback();
+
+    this.$['*eventEmitter'].unbindTarget(this);
+  }
 }
 
 /**
diff --git a/blocks/UploadList/UploadList.js b/blocks/UploadList/UploadList.js
index 9195771ab..9c20b5745 100644
--- a/blocks/UploadList/UploadList.js
+++ b/blocks/UploadList/UploadList.js
@@ -16,6 +16,9 @@ import { debounce } from '../utils/debounce.js';
  */
 
 export class UploadList extends UploaderBlock {
+  // Context owner should have access to CSS l10n
+  // TODO: We need to move away l10n from CSS
+  couldBeCtxOwner = true;
   historyTracked = true;
   activityType = ActivityBlock.activities.UPLOAD_LIST;
 
diff --git a/blocks/UrlSource/UrlSource.js b/blocks/UrlSource/UrlSource.js
index 31270113e..22a30feac 100644
--- a/blocks/UrlSource/UrlSource.js
+++ b/blocks/UrlSource/UrlSource.js
@@ -3,6 +3,7 @@ import { ActivityBlock } from '../../abstract/ActivityBlock.js';
 import { UploadSource } from '../utils/UploadSource.js';
 
 export class UrlSource extends UploaderBlock {
+  couldBeCtxOwner = true;
   activityType = ActivityBlock.activities.URL;
 
   init$ = {