I run Brave without an adblocker and have found it to be much faster than Firefox (with adblocker and pi-hole).
Also, as someone whose startup has both Chrome and Firefox extensions, I have to say the Firefox reviewers (who review releases and hold up the process — not end user reviewers) can be hugely annoying, and we deploy there as infrequently as possible. As a result, our Firefox customers don’t get all the latest bells and whistles. Wish it weren’t that way, but the process takes months!
Edit: clarified the annoying reviewers are not end users reviewers, but the people who suck up months of time for every minor update, making confused complaints about our code, and even UI implementation.