import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
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<head></head><body><p>Original content</p>
<script>
window.opener.postMessage("", "*");
confirm ("Message");
document.write ("Extra content");
window.opener.postMessage(document.documentElement.innerHTML, "*");
</script></body>