

It does work with Firefox plugins, there just isn’t a button to open the extension “store” in the extensions settings page like stock Firefox has. You can add them by manually going to the url though, it’s just recommended that you don’t since that increases your risk of adding a malicious plugin or being fingerprinted, etc. I still added a few plugins that I really dislike not having though, like a password manager and darkreader, just because I valued the convenience slightly more than the added security.
Imo I don’t think the goal is/should be “every part is repairable by any average person without tools” tbh. Like that would be awesome but it also isn’t realistic, like you said phones are super complicated. But making simple repairs – stuff like swapping a battery – possible for anybody is realistic imo, and then the rest should be as easy to repair as possible for local shops or someone who does have the necessary skills and equipment. At least personally I feel like that’s a good spot to aim for.