Bug 634387 - "[Mac] Firefox 4.0b12pre crash in mozilla::plugins::PPluginInstanceChild::FatalError [@ mozalloc_abort | NS_DebugBreak_P] opening a tab with Cmd-T while a Flash video has focus (youtube)" [r=smichaud, a=hardblocker]

widget/src/cocoa/nsChildView.mm

@@ -5761,6 +5761,7 @@ static const char* ToEscapedString(NSString* aString, nsCAutoString& aBuf)
   [self convertCocoaKeyEvent:theEvent toGeckoEvent:&geckoEvent];
 
   // create event for use by plugins
+  if (mIsPluginView) {
 #ifndef NP_NO_CARBON
     EventRecord carbonEvent;
     if (mPluginEventModel == NPEventModelCarbon) {
@@ -5773,6 +5774,7 @@ static const char* ToEscapedString(NSString* aString, nsCAutoString& aBuf)
       ConvertCocoaKeyEventToNPCocoaEvent(theEvent, cocoaEvent, message);
       geckoEvent.pluginEvent = &cocoaEvent;
     }
+  }
 
   mGeckoChild->DispatchWindowEvent(geckoEvent);