diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/extensions/scope-001.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/extensions/scope-001.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,83 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = '53268';
+var status = 'Testing scope after changing obj.__proto__';
+var expect= '';
+var actual = '';
+var obj = {};
+const five = 5;
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+
+function test()
+{
+  enterFunc ("test");
+  printBugNumber(BUGNUMBER);
+  printStatus (status);
+
+
+  status= 'Step 1:  setting obj.__proto__ = global object';
+  obj.__proto__ = this;
+
+  actual = obj.five;
+  expect=5;
+  reportCompare (expect, actual, status);
+
+  obj.five=1;
+  actual = obj.five;
+  expect=5;
+  reportCompare (expect, actual, status);
+
+
+
+  status= 'Step 2:  setting obj.__proto__ = null';
+  obj.__proto__ = null;
+
+  actual = obj.five;
+  expect=undefined;
+  reportCompare (expect, actual, status);
+
+  obj.five=2;
+  actual = obj.five;
+  expect=2;
+  reportCompare (expect, actual, status);
+
+
+ 
+  status= 'Step 3:  setting obj.__proto__  to global object again';
+  obj.__proto__ = this;
+
+  actual = obj.five;
+  expect=2;  //<--- (FROM STEP 2 ABOVE)
+  reportCompare (expect, actual, status);
+
+  obj.five=3;
+  actual = obj.five;
+  expect=3;
+  reportCompare (expect, actual, status);
+
+
+
+  status= 'Step 4:  setting obj.__proto__   to  null again';
+  obj.__proto__ = null;
+
+  actual = obj.five;
+  expect=3;  //<--- (FROM STEP 3 ABOVE)
+  reportCompare (expect, actual, status);
+
+  obj.five=4;
+  actual = obj.five;
+  expect=4;
+  reportCompare (expect, actual, status);
+
+
+  exitFunc ("test");
+}