test.xul file

And I use this as tests.xul file now, for easy file browsing:

<?xml version="1.0"?>
<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
        width="600" height="600">
  <script type="application/javascript"><![CDATA[
function doe2(e) {
  var str = 'chrome://tests/content/'+e.target.href.replace('file:///C:/testfiles/','');
  e.target.href = str;
  window.location = str;
  e.preventDefault();
}

function doe() {
  document.getElementById('content').contentWindow.addEventListener('click', doe2, true);
}
  ]]></script>
  <browser id="content" flex="1" src="file:///C:/testfiles/" type="content-primary" onload="doe()"/>
</window>