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<head>
<style type="text/css" id="s"></style>
<script type="text/javascript">
function lo()
{
window.onerror = oe;
setTimeout(function(){ location.reload(); }, 200);
}
function oe(a,b,c)
{
document.getElementById("s").textContent = ".nosuch { color: red }";
}
</script>
</head>
<body onload="lo();">
<xul:preference/>
<xul:tabs/>
</body>
</html>