Backed out changeset 7b1f88583896 (bug 1342207) for frequently failing browser_ext_tabs_onHighlighted.js. r=backout

browser/components/extensions/ext-utils.js

@@ -156,7 +156,6 @@ class TabTracker extends TabTrackerBase {
 
     windowTracker.addListener("TabClose", this);
     windowTracker.addListener("TabOpen", this);
-    windowTracker.addListener("TabSelect", this);
     windowTracker.addOpenListener(this._handleWindowOpen);
     windowTracker.addCloseListener(this._handleWindowClose);
 
@@ -264,14 +263,6 @@ class TabTracker extends TabTrackerBase {
           this.emitRemoved(nativeTab, false);
         }
         break;
-
-      case "TabSelect":
-        // Because we are delaying calling emitCreated above, we also need to
-        // delay sending this event because it shouldn't fire before onCreated.
-        Promise.resolve().then(() => {
-          this.emitActivated(nativeTab);
-        });
-        break;
     }
   }
 
@@ -317,9 +308,6 @@ class TabTracker extends TabTrackerBase {
       for (let nativeTab of window.gBrowser.tabs) {
         this.emitCreated(nativeTab);
       }
-
-      // emitActivated to trigger tab.onActivated/tab.onHighlighted for a newly opened window.
-      this.emitActivated(window.gBrowser.tabs[0]);
     }
   }
 
@@ -341,19 +329,6 @@ class TabTracker extends TabTrackerBase {
     }
   }
 
-  /**
-   * Emits a "tab-activated" event for the given tab element.
-   *
-   * @param {NativeTab} nativeTab
-   *        The tab element which has been activated.
-   * @private
-   */
-  emitActivated(nativeTab) {
-    this.emit("tab-activated", {
-      tabId: this.getId(nativeTab),
-      windowId: windowTracker.getId(nativeTab.ownerGlobal)});
-  }
-
   /**
    * Emits a "tab-attached" event for the given tab element.
    *