Thanks for taking your time read. I agree, this new system gives a very scary impression.

Ajay, the author of SponsorBlock and DeArrow, has also raised this issue with Mozilla. He explains how the new wording can make an existing extension look like it suddenly started collecting new data, without making clear which websites it can access. You can read his post on Mozilla’s forum here: https://discourse.mozilla.org/t/the-new-data-transmission-permissions-seem-to-be-misleading-to-users/149410

But in reality - the extension can only access these permissions on two sites - YouTube and it's own returnyoutubedislike - on all other sites it's not even allowed to "turn on".

Personally identifiable information - RYD’s randomly generated private user ID used to count votes, not your real identity.
Browsing activity - i.e. navigating to the next video, so that the next dislikes can be shown
Website content - i.e. the like\dislike container element
Website activithy - i.e. clicking like or dislike button.

As I already said - only on YouTube. Not everywhere.