hi guys, Flash is History!! try Improvedtube.com though.
( ​https://github.com/code4charity/YouTube-Extension/blob/master/README.md ).
, it is the only big Youtube extension developed openly and since several years and Recommended By Firefox 🦊 .
(the alternatives resigned along the way, because it requires continuous updates)
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Does not work. Firefox version 52.9.0.

Good

not working on my firefox 52

it doesn't work

مشكور لكم