--- a/dom/media/MediaQueue.h
+++ b/dom/media/MediaQueue.h
@@ -49,17 +49,16 @@ public:
     mPushEvent.Notify(RefPtr<T>(aItem));
   }
 
   inline void PushFront(T* aItem) {
     ReentrantMonitorAutoEnter mon(mReentrantMonitor);
     MOZ_ASSERT(aItem);
     NS_ADDREF(aItem);
     nsDeque::PushFront(aItem);
-    mPushEvent.Notify(RefPtr<T>(aItem));
   }
 
   inline already_AddRefed<T> PopFront() {
     ReentrantMonitorAutoEnter mon(mReentrantMonitor);
     RefPtr<T> rv = dont_AddRef(static_cast<T*>(nsDeque::PopFront()));
     if (rv) {
       mPopEvent.Notify(rv);
     }