import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

This commit is contained in:
Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
150858 changed files with 23884658 additions and 0 deletions

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document.execCommand("undo", false, null);
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document.execCommand("strikethrough", false, null);
document.addEventListener("DOMSubtreeModified", uu, false);
document.execCommand("undo", false, null);
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