The Tor Browser / file revision

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 <?xml-stylesheet href="chrome://global/skin/" type="text/css"?>

 <window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" onload="setTimeout(boom, 0);">

 <script type="text/javascript">

 var XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";

 function boom()

 {

   // Fire off an image load, then leave while the image load is pending.

   document.getElementById("image").src = "data:text/html,foo";

   location = "data:text/html,elsewhere";

 }

 </script>

 <tree><treechildren/></tree><image id="image"/>

 </window>