diff --git a/content/base/src/nsFrameLoader.cpp b/content/base/src/nsFrameLoader.cpp
index b59ae1483006..bbf60ef88520 100644
--- a/content/base/src/nsFrameLoader.cpp
+++ b/content/base/src/nsFrameLoader.cpp
@@ -1620,7 +1620,7 @@ nsFrameLoader::MaybeCreateDocShell()
     nsCOMPtr<nsIObserverService> os = services::GetObserverService();
     if (os) {
       os->NotifyObservers(NS_ISUPPORTS_CAST(nsIFrameLoader*, this),
-                          "in-process-browser-frame-shown", NULL);
+                          "in-process-browser-or-app-frame-shown", NULL);
     }
 
     if (mMessageManager) {
diff --git a/dom/browser-element/BrowserElementParent.js b/dom/browser-element/BrowserElementParent.js
index bc67c5b48e8b..7580aabbfddb 100644
--- a/dom/browser-element/BrowserElementParent.js
+++ b/dom/browser-element/BrowserElementParent.js
@@ -120,7 +120,7 @@ BrowserElementParentFactory.prototype = {
 
     var os = Cc["@mozilla.org/observer-service;1"].getService(Ci.nsIObserverService);
     os.addObserver(this, 'remote-browser-frame-shown', /* ownsWeak = */ true);
-    os.addObserver(this, 'in-process-browser-frame-shown', /* ownsWeak = */ true);
+    os.addObserver(this, 'in-process-browser-or-app-frame-shown', /* ownsWeak = */ true);
   },
 
   _browserFramesPrefEnabled: function() {
@@ -161,7 +161,7 @@ BrowserElementParentFactory.prototype = {
     case 'remote-browser-frame-shown':
       this._observeRemoteBrowserFrameShown(subject);
       break;
-    case 'in-process-browser-frame-shown':
+    case 'in-process-browser-or-app-frame-shown':
       this._observeInProcessBrowserFrameShown(subject);
       break;
     case 'content-document-global-created':