diff --git a/dom/plugins/ipc/PluginModuleParent.cpp b/dom/plugins/ipc/PluginModuleParent.cpp
index e114ef88414d..e0f1b8327b78 100755
--- a/dom/plugins/ipc/PluginModuleParent.cpp
+++ b/dom/plugins/ipc/PluginModuleParent.cpp
@@ -897,6 +897,13 @@ CreateFlashMinidump(DWORD processId, ThreadId childThread,
 bool
 PluginModuleChromeParent::ShouldContinueFromReplyTimeout()
 {
+    if (mIsFlashPlugin) {
+        MessageLoop::current()->PostTask(
+            FROM_HERE,
+            mTaskFactory.NewRunnableMethod(
+                &PluginModuleChromeParent::NotifyFlashHang));
+    }
+
 #ifdef XP_WIN
     if (LaunchHangUI()) {
         return true;
@@ -1279,6 +1286,15 @@ PluginModuleChromeParent::ActorDestroy(ActorDestroyReason why)
     PluginModuleParent::ActorDestroy(why);
 }
 
+void
+PluginModuleParent::NotifyFlashHang()
+{
+    nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
+    if (obs) {
+        obs->NotifyObservers(nullptr, "flash-plugin-hang", nullptr);
+    }
+}
+
 void
 PluginModuleParent::NotifyPluginCrashed()
 {
diff --git a/dom/plugins/ipc/PluginModuleParent.h b/dom/plugins/ipc/PluginModuleParent.h
index 28c3f3515ba7..33c07e87ac64 100644
--- a/dom/plugins/ipc/PluginModuleParent.h
+++ b/dom/plugins/ipc/PluginModuleParent.h
@@ -259,6 +259,7 @@ protected:
     void InitAsyncSurrogates();
 
 protected:
+    void NotifyFlashHang();
     void NotifyPluginCrashed();
     void OnInitFailure();