Brave is being forced to use Googles version of Manifest 3 meaning ad blockers and anti trackers are crippled in favour of advertisers and Googles ad business. Brave will be including 4 manifest 2 extensions in its backend but that's it. They're stuck because Google decided to screw over the entire Chrome based ecosystem.

Mozilla is implementing Manifest 3 differently so the original techniques for adblocking and privacy still work.

So the only choice is Librewolf. Sacrificing privacy and security for smoother animations and Web translation of pages is not worth it.