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diff --git a/js/xpconnect/tests/chrome/test_exposeInDerived.xhtml b/js/xpconnect/tests/chrome/test_exposeInDerived.xhtml
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+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=804630
+-->
+<window title="Mozilla Bug 804630"
+ xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+ <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+
+ <!-- test results are displayed in the html:body -->
+ <body xmlns="http://www.w3.org/1999/xhtml">
+ <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=804630"
+ target="_blank">Mozilla Bug 804630</a>
+ </body>
+
+ <!-- test code goes here -->
+ <script type="application/javascript">
+ <![CDATA[
+ /** Test to make sure that COWed objects can't expose properties from their prototypes. **/
+ // Set up the sandbox.
+ var sb = new Cu.Sandbox("https://www.example.com");
+ sb.ok = ok;
+ sb.is = is;
+
+ // Make a chrome object that tries to expose objects off its prototype.
+ sb.proto = { read: 42, readWrite: 32 };
+ sb.obj = {};
+ sb.obj.__proto__ = sb.proto;
+
+ // Make sure we can't access any of the properties on the prototype directly.
+ Cu.evalInSandbox('is(proto.read, undefined, "proto.read inaccessible");', sb);
+ Cu.evalInSandbox('var wrote = false; ' +
+ 'try { proto.readWrite = 12; wrote = true; } catch(e) {} ' +
+ ' ok(!wrote, "Should not write proto property");', sb);
+
+ // Make sure we can't access the exposed properties via the derived object.
+ Cu.evalInSandbox('is(obj.read, undefined, "obj.read inaccessible");', sb);
+ Cu.evalInSandbox('is(obj.readWrite, undefined, "obj.readWrite is not readable");', sb);
+ Cu.evalInSandbox('try { obj.readWrite = 8; ok(false, "obj.readWrite is not writable"); } catch (e) {};',
+ sb);
+
+ ]]>
+ </script>
+</window>