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<?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="boom();">
<script type="text/javascript">
function boom()
{
var c = document.getElementById("c");
var n = document.createElementNS("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul", "listitem");
n.textContent = "b";
c.parentNode.insertBefore(n, c);
}
</script>
<listbox id="listbox">
<listitem id="a">a</listitem>
<listitem id="c">c</listitem>
</listbox>
</window>
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