Bug 626608: Make sure plugin is in a state to receive callbacks before calling NPP_UrlRedirectNotify. r=bsmedberg a=blocking2.0final+

modules/plugin/base/src/nsNPAPIPluginStreamListener.cpp

@@ -844,7 +844,7 @@ nsNPAPIPluginStreamListener::HandleRedirectNotification(nsIChannel *oldChannel,
     return false;
   }
 
-  if (!mInst) {
+  if (!mInst || !mInst->CanFireNotifications()) {
     return false;
   }