This seems very worthwhile, good on you for forking and resurrecting this.
It might be worth you updating the about page to say what lightly is - I had to google and find the original git to work it out. I’m still not even entirely clear - this seems to be more than a theme? As well as retheme Breeze It also seems to expand on what Breeze does?
Your project can stand on its own merits rather than just referencing defunct projects - that might help future new contributors better understand what the ask is and get then more interested / excited about helping?
Why would I say no? If it can be turned off I don’t care. Mozilla might get some money from the idiotic AI frenzy which will help keep them going.
Of course if its implemented badly to affect privacy and security then no. But forks of Firefox like Fennac and Librewolf will strip this stuff out. I’m no fan of this AI nonsense but I haven’t seen anything yet to suggest this is anything more than a gimmick.