Why does it need the access to all the tabs and all the websites? And this is not even addressed in the description.

Pourrait être bien mais il n'y a que la définition qui fonctionne chez moi, l'autoplay ne fonctionne pas, les sous-titres ne s'enlèvent pas lorsque je sélectionne Off, et même la résolution, ça me descend ma fenêtre d'un scroll quand ça s'enclenche, dommage

ok

It locked my playing speed, I can't speed up my video by using youtube's default settings, only can change in this addon and have to f5

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On the mobile (Android) it causes Youtube comments in Shorts not to be clickable / openable anymore. Has to be fixed. Will be disabled until fixed. Otherwise great plugin.

Check Mozilla support.

Access your data for all websites

The extension could read the content of any web page you visit, as well as data you enter into those web pages, such as usernames and passwords.

As mentioned by others, requires access to all websites when just youtube would be fine. And it does not work on Android at all.