--- a/dom/html/HTMLMediaElement.cpp
+++ b/dom/html/HTMLMediaElement.cpp
@@ -5531,17 +5531,17 @@ void HTMLMediaElement::ChangeReadyState(
     mLoadedDataFired = true;
   }
 
   if (oldState < nsIDOMHTMLMediaElement::HAVE_FUTURE_DATA &&
       mReadyState >= nsIDOMHTMLMediaElement::HAVE_FUTURE_DATA) {
     DispatchAsyncEvent(NS_LITERAL_STRING("canplay"));
     if (!mPaused) {
       mWaitingForKey = NOT_WAITING_FOR_KEY;
-      DispatchAsyncEvent(NS_LITERAL_STRING("playing"));
+      NotifyAboutPlaying();
     }
   }
 
   CheckAutoplayDataReady();
 
   if (oldState < nsIDOMHTMLMediaElement::HAVE_ENOUGH_DATA &&
       mReadyState >= nsIDOMHTMLMediaElement::HAVE_ENOUGH_DATA) {
     DispatchAsyncEvent(NS_LITERAL_STRING("canplaythrough"));