Bug 745744 - Geolocation doorhanger might cause zombie compartments because it keeps callbacks alive, r=gavin, a=desktop-only

toolkit/content/PopupNotifications.jsm

@@ -607,6 +607,9 @@ PopupNotifications.prototype = {
       }
     }, this);
 
+    while (this.panel.lastChild)
+      this.panel.removeChild(this.panel.lastChild);
+
     this._update();
   },