diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_2/instanceof/instanceof-003.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_2/instanceof/instanceof-003.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,65 @@
+/* -*- 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/. */
+
+
+/**
+   File Name:          instanceof-003.js
+   ECMA Section:
+   Description:        http://bugzilla.mozilla.org/show_bug.cgi?id=7635
+
+   js> function Foo() {}
+   js> theproto = {};
+   [object Object]
+   js> Foo.prototype = theproto
+   [object Object]
+   js> theproto instanceof Foo
+   true
+
+   I think this should be 'false'
+
+
+   Author:             christine@netscape.com
+   Date:               12 november 1997
+
+   Modified to conform to ECMA3
+   https://bugzilla.mozilla.org/show_bug.cgi?id=281606
+*/
+var SECTION = "instanceof-003";
+var VERSION = "ECMA_2";
+var TITLE   = "instanceof operator";
+var BUGNUMBER ="7635";
+
+startTest();
+
+function Foo() {};
+theproto = {};
+Foo.prototype = theproto;
+
+AddTestCase(
+  "function Foo() = {}; theproto = {}; Foo.prototype = theproto; " +
+  "theproto instanceof Foo",
+  false,
+  theproto instanceof Foo );
+
+
+var o = {};
+
+// https://bugzilla.mozilla.org/show_bug.cgi?id=281606
+try
+{
+  AddTestCase(
+    "o = {}; o instanceof o",
+    "error",
+    o instanceof o );
+}
+catch(e)
+{
+  AddTestCase(
+    "o = {}; o instanceof o",
+    "error",
+    "error" );
+}
+
+test();