--- a/dom/browser-element/BrowserElementChildPreload.js
+++ b/dom/browser-element/BrowserElementChildPreload.js
@@ -1222,17 +1222,16 @@ BrowserElementChild.prototype = {
    * Called when the window which contains this iframe becomes hidden or
    * visible.
    */
   _recvOwnerVisibilityChange: function(data) {
     debug("Received ownerVisibilityChange: (" + data.json.visible + ")");
     var visible = data.json.visible;
     if (docShell && docShell.isActive !== visible) {
       docShell.isActive = visible;
-      sendAsyncMsg('visibilitychange', {visible: visible});
 
       // Ensure painting is not frozen if the app goes visible.
       if (visible && this._paintFrozenTimer) {
         this.notify();
       }
     }
   },
 

--- a/dom/browser-element/BrowserElementParent.js
+++ b/dom/browser-element/BrowserElementParent.js
@@ -167,17 +167,16 @@ BrowserElementParent.prototype = {
       "got-screenshot": this._gotDOMRequestResult,
       "got-contentdimensions": this._gotDOMRequestResult,
       "got-can-go-back": this._gotDOMRequestResult,
       "got-can-go-forward": this._gotDOMRequestResult,
       "requested-dom-fullscreen": this._requestedDOMFullscreen,
       "fullscreen-origin-change": this._fullscreenOriginChange,
       "exit-dom-fullscreen": this._exitDomFullscreen,
       "got-visible": this._gotDOMRequestResult,
-      "visibilitychange": this._childVisibilityChange,
       "got-set-input-method-active": this._gotDOMRequestResult,
       "scrollviewchange": this._handleScrollViewChange,
       "caretstatechanged": this._handleCaretStateChanged,
       "findchange": this._handleFindChange,
       "execute-script-done": this._gotDOMRequestResult,
       "got-web-manifest": this._gotDOMRequestResult,
     };
 
@@ -857,26 +856,16 @@ BrowserElementParent.prototype = {
   /**
    * Called when the visibility of the window which owns this iframe changes.
    */
   _ownerVisibilityChange: function() {
     this._sendAsyncMsg('owner-visibility-change',
                        {visible: !this._window.document.hidden});
   },
 
-  /*
-   * Called when the child notices that its visibility has changed.
-   */
-  _childVisibilityChange: function(data) {
-    debug("_childVisibilityChange(" + data.json.visible + ")");
-    this._frameLoader.visible = data.json.visible;
-
-    this._fireEventFromMsg(data);
-  },
-
   _requestedDOMFullscreen: function() {
     this._pendingDOMFullscreen = true;
     this._windowUtils.remoteFrameFullscreenChanged(this._frameElement);
   },
 
   _fullscreenOriginChange: function(data) {
     Services.obs.notifyObservers(
       this._frameElement, "fullscreen-origin-change", data.json.originNoSuffix);