hi guys! flash is History!! try Improvedtube.com tho
( ​https://github.com/code4charity/YouTube-Extension/blob/master/README.md ).
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it is the only big Youtube extension developed openly and since several years.
(All alternatives resigned along the way, because it requires continous updates)
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This extension actually works in private mode using Opera's VPN. It blocks sites from seeing your real IP address alongside with Opera's VPN IP. I tried all other extensions and they failed.