The Tor Browser / file revision

 <?xml version="1.0"?>

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

 <window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" onload="document.getElementById('listbox').removeChild(document.getElementById('span'));">

 <bindings xmlns="http://www.mozilla.org/xbl">

   <binding id="foo">

     <content><listitem xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"><children xmlns="http://www.mozilla.org/xbl"/></listitem></content>

   </binding>

 </bindings>

 <listbox id="listbox" style="-moz-binding: url(#foo)"><span xmlns="http://www.w3.org/1999/xhtml" id="span"/></listbox>

 </window>