AG-27583 fix multiple injection to the pages

packages/tswebextension/src/lib/mv3/tabs/tabs-cosmetic-injector.ts

@@ -8,6 +8,7 @@ import { MAIN_FRAME_ID } from '../../common/constants';
 import { CosmeticApi } from '../background/cosmetic-api';
 import { CosmeticFrameProcessor } from '../background/cosmetic-frame-processor';
 import { ContentType } from '../../common';
+import { appContext } from '../background/app-context';
 
 /**
  * Injects cosmetic rules into tabs, opened before app initialization.
@@ -82,6 +83,14 @@ export class TabsCosmeticInjector {
                 documentId,
             });
 
+            /**
+             * This condition prevents applying cosmetic rules to the tab multiple times.
+             * Applying them once after the extension's initialization is sufficient.
+             */
+            if (appContext.startTimeMs && (currentTime - appContext.startTimeMs) > 10000) {
+                return;
+            }
+
             // Note: this is an async function, but we will not await it because
             // events do not support async listeners.
             Promise.all([