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<html>
<head>
<script>
onload = function() {
var x = null;
try {
x = document.createElementNS("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul", "spacer");
} catch(ex) {}
window.parent.postMessage(x == null, "http://mochi.test:8888");
}
</script>
</head>
<body>
Here be dragons!
</body>
</html>