Pretty good. Have many needed features.

Was looking for these features for so long. Super must to have Addon.

Amazing add-on, nothing to add to it, got everything!

I strongly echo many comments in this review area.
Maxim, please communicate to us regarding the difficulties involved in modifying "Enhancer for YouTube™ by Maxime RF" ( or modifying a recently compatible extension, in general, to achieve this ).
(( By the way, the following is your website, correct ? :
https://www.mrfdev.com/enhancer-for-youtube ))
so that it is correctly signed for current inclusion as an extension for Firefox Quantum ( a change in security for FF users since one of FF's most recent updates. I have
66.0.3 and about to UD to 66.0.4 in a couple mins.

Thank you for your time and your great extension,

Looking forward to your reply.

Сделайте чтобы язык субтитров по умолчанию был русский или чтобы можно было выбирать язык по умолчанию а то он всегда сбрасывается на английский.