Mozilla should really try taking their extension ecosystem seriously, and deliver features like the AI chatbot integration as first-party extensions that come pre-installed but can be easily managed by users with a much better UI than about:config.
And if it can't... often it's worth asking if it should be possible.
Putting the chat or sidebar in the core of the browser sounds very much like something done by a developer who wasn't around for Mozilla prior to Firefox, and isn't aware of the original goal of being the antithesis of the browser that included everything and the kitchen sink.