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

<script type="text/javascript">

function boom()
{
  var tree = document.getElementById("tree");
  var tc = document.createElementNS("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul", "treechildren");
  
  document.addEventListener("DOMAttrModified", m, false);
  
  tree.appendChild(tc);
  
  function m()
  {
    document.removeEventListener("DOMAttrModified", m, false);
    tree.removeChild(tc);
  }
}

</script>

<tree id="tree" />

</window>