Does nothing

Firefox is the best but most of the add-ons other people offer you are complete junk. Maybe you can get lucky and one works.

On Debian 12 (32 bit) it has no functionality and no icon appears anywhere on the YouTube screen; it worked on this device with Win. 10 installed.

very good thanks

Doesn't seems to work. No button on the YouTube page 😢

Extension greyed out. N effect on anything either.

FYUGFHHÑL

Ne fonctionne pas sur Fire-Fox

Does not work with FF ESR 102

動作しない｡

Simple and easy to use, just preset for Youtube, exactly what I needed.
Nothing more, nothing less. Just perfect.

Thanks a lot developer.

very good thanks

I have to create an account to give this 1 star, this do nothing, you can't control anything and presets are horrible, really really horrible