diff --git a/widget/tests/Makefile.in b/widget/tests/Makefile.in
index 0507b8a0a7f1..8034e4e08e12 100644
--- a/widget/tests/Makefile.in
+++ b/widget/tests/Makefile.in
@@ -30,9 +30,6 @@ endif
 
 CPP_UNIT_TESTS += TestAppShellSteadyState.cpp
 
-MOCHITEST_FILES =	test_bug760802.html \
-		$(NULL)
-
 MOCHITEST_CHROME_FILES =	test_bug343416.xul \
 		test_bug429954.xul \
 		window_bug429954.xul \
@@ -58,6 +55,7 @@ MOCHITEST_CHROME_FILES =	test_bug343416.xul \
 		test_position_on_resize.xul \
 		empty_window.xul \
 		test_sizemode_events.xul \
+		test_bug760802.xul \
 		$(NULL)
 
 # test_bug413277.html mac-only based on 604789, 605178
diff --git a/widget/tests/test_bug760802.html b/widget/tests/test_bug760802.xul
similarity index 55%
rename from widget/tests/test_bug760802.html
rename to widget/tests/test_bug760802.xul
index 31e4e4ccc786..0a5fc5fe67ed 100644
--- a/widget/tests/test_bug760802.html
+++ b/widget/tests/test_bug760802.xul
@@ -1,31 +1,32 @@
-<!DOCTYPE HTML>
-<html>
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="/tests/SimpleTest/test.css"?>
 <!--
 https://bugzilla.mozilla.org/show_bug.cgi?id=760802
 -->
-<head>
-  <meta charset="utf-8">
-  <title>Test for Bug 760802</title>
-  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
-  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
-        <style>
          .commit-tease,
          .user-profile-mini-avatar,
          .avatar,
          .vcard-details,
          .signup-prompt-bg {
            display: none !IMPORTANT;
          }
        </style>
         <script>
          document.addEventListener('DOMContentLoaded', function() {
            this.querySelectorAll('a').forEach(anchor => {
              anchor.addEventListener('click', e => {
                e.preventDefault();

                const redact = new URLSearchParams(window.location.search).get('redact');
                const hasExistingParams = anchor.href.includes('?');
                window.location.href = anchor.href + (hasExistingParams ? `&redact=${redact}` : `?redact=${redact}`);
              });
            });
          });
        </script>
 </head>
-<body>
-<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=760802">Mozilla Bug 760802</a>
-<p id="display"></p>
-<div id="content" style="display: none">
-
-</div>
-<iframe id="iframe_not_editable" width="300" height="150"
-        src="data:text/html,&lt;html&gt;&lt;body&gt;&lt;/body&gt;&lt;/html&gt;"></iframe><br/>
-<pre id="test">
-<script type="application/javascript">
-
-netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
+<window title="Mozilla Bug 760802"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+  <script type="application/javascript" 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=760802"
+     target="_blank">Mozilla Bug 760802</a>
+  <p id="display"></p>
+  <div id="content" style="display: none"/>
+  <iframe id="iframe_not_editable" width="300" height="150"
+          src="data:text/html,&lt;html&gt;&lt;body&gt;&lt;/body&gt;&lt;/html&gt;"/><br/>
+  </body>
+
+  <!-- test code goes here -->
+  <script type="application/javascript"><![CDATA[
+SimpleTest.waitForExplicitFinish();
+
 const Cc = Components.classes;
 const Ci = Components.interfaces;
 
 function getBaseWindowInterface(win) {
-  return SpecialPowers.wrap(win).QueryInterface(Ci.nsIInterfaceRequestor)
+  return win.QueryInterface(Ci.nsIInterfaceRequestor)
     .getInterface(Ci.nsIWebNavigation)
     .QueryInterface(Ci.nsIDocShellTreeItem)
     .treeOwner
@@ -45,15 +46,14 @@
     fun.call();
     return false;
   } catch (e) {
-    $("display").innerHTML += "<br>OK thrown: "+e.message;
+    $("display").innerHTML += "<br/>OK thrown: "+e.message;
     return (e instanceof Components.Exception &&
             e.result === exception)
   }
 }
 function doesntThrowException(fun) !shouldThrowException(fun)
 
-
-var baseWindow = getBaseWindowInterface(window);
+var baseWindow = getBaseWindowInterface(this);
 var nativeHandle = baseWindow.nativeHandle;
 $("display").innerHTML = "found nativeHandle for this window: "+nativeHandle;
 
@@ -70,12 +70,12 @@
 ok(typeof(nativeHandle) === "string", "nativeHandle should be a string");
 ok(nativeHandle.match(/^0x[0-9a-f]+$/), "nativeHandle should have a memory address format");
 
-var iWin = window.document.getElementById("iframe_not_editable").contentWindow;
+var iWin = document.getElementById("iframe_not_editable").contentWindow;
 is(getBaseWindowInterface(iWin).nativeHandle, nativeHandle,
-              "the nativeHandle of an iframe should be its parent's nativeHandle");
+   "the nativeHandle of an iframe should be its parent's nativeHandle");
 
-var dialog = SpecialPowers.wrap(window).openDialog("data:text/plain,this is an active window.", "_blank",
-                               "chrome,dialog=yes,width=100,height=100");
+var dialog = win.openDialog("data:text/plain,this is an active window.", "_blank",
+                            "chrome,dialog=yes,width=100,height=100");
 
 isnot(getBaseWindowInterface(dialog).nativeHandle, "",
       "the nativeHandle of a dialog should not be empty");
@@ -84,7 +84,6 @@
 
 todo(false, "the nativeHandle of a window without a mainWidget should be empty"); // how to build a window without a mainWidget ?
 
-</script>
-</pre>
-</body>
-</html>
+SimpleTest.finish();
+  ]]></script>
+</window>
