Issue 1985 - Replaced __proto__ with Object.create() and Object.getPrototypeOf()

safari/ext/popup.js

 (function()
 {
   // Safari doesn't adjust the size of the popover automatically to the size
   // of its content, like when the ad counter is expanded/collapsed. So we add
   // event listeners to do so.
   var mayResize = true;
   var resizingScheduled = false;
 
   var updateSize = function()
   {
@@ skipping 55 matching lines @@
   // listener to do so.
   safari.application.addEventListener("activate", function()
   {
     safari.self.hide();
   }, true);
 
 
   // import ext into the javascript context of the popover. This code might fail,
   // when the background page isn't ready yet. So it is important to put it below
   // the reloading code above.
-  window.ext = {
-    __proto__: safari.extension.globalPage.contentWindow.ext,
+  window.ext = Object.create(safari.extension.globalPage.contentWindow.ext);
 
-    closePopup: function()
-    {
-      safari.self.hide();
-    }
+  ext.closePopup = function()
+  {
+    safari.self.hide();
   };
 })();