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therealjumbo
on Dec 7, 2017
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A Classic Extension Reborn: Tree Style Tab
FYI, you need this at the top of your userChrome.css:
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
See more details here:
http://kb.mozillazine.org/index.php?title=UserChrome.css&pri...
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