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<html>
<head>
<title>A popup!</title>
</head>
<body>
<h1>hi!</h1>
<script>
SpecialPowers.wrap(document).userInteractionForTesting();
if (window.location.search == "?messageme") {
window.opener.postMessage("done", "*");
}
window.close();
</script>
</body>
</html>