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<html>
<head>
<script>
function boom()
{
window.addEventListener("DOMSubtreeModified", function(){}, false);
var m = document.createElementNS("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul", "menuitem");
document.body.appendChild(m);
m.setAttribute("type", "checkbox");
m.setAttribute("checked", "true");
m.removeAttribute("type");
}
</script>
</head>
<body onload="boom();"></body>
</html>
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