I was a Brave hardcore user but decided to just try Firefox again and really liking it so far.

Can't really say why though, it just feels nice. For extensions, Multi account containers and uBlock origin are nice. You can also hook up the containers with proxies so that when you're in container A, all sites in that container get loaded over that proxy connection.

But there wasn't a killer feature in Brave that kept me there, and there also isn't a killer feature in Firefox that's keeping me here though