--- a/docshell/test/chrome/test_bug454235.xul
+++ b/docshell/test/chrome/test_bug454235.xul
@@ -16,17 +16,17 @@ https://bugzilla.mozilla.org/show_bug.cg
   </body>
 
   <!-- test code goes here -->
   <script type="application/javascript"><![CDATA[
 
     /** Test for Bug 454235 **/
 SimpleTest.waitForExplicitFinish();
 
-addLoadEvent(doTest);
+SimpleTest.waitForFocus(doTest);
 
 function doTest() {
   var shownBrowser = document.getElementById("shownBrowser");
   var hiddenBrowser = document.getElementById("hiddenBrowser");
   var offScreenBrowser = document.getElementById("offScreenBrowser");
   var offScreenSubBrowser = offScreenBrowser.contentDocument.getElementById("topBrowser");
   var offScreenBurriedBrowser = offScreenBrowser.contentDocument.getElementById("burriedBrowser");