Upon further review, I will not be switching to Brave.
First and foremost, it's a Chromium based browser. Chromium is the base code that Google developed for Google Chrome. By using Brave, you are essentially supporting Google. Maybe not directly, but in the "market share wars", Firefox is a drop in the bucket compared to Chromium (Chrome, MS Edge, and Opera are all Chromium). Chromium has a very dynamic code, so on any given update there could be Google spyware added. Same situation for the extensions, which come from the Chrome web store. No amount of virtue signalling from a Mozilla executive will get me to switch to a Google product.
A second problem is they claim to block trackers etc... by default, but people have found that Google and Facebook trackers are on some kind of whitelist, so they block everything except two of the largest privacy-invading companies in the world. I'm surprised Amazon isn't on the list too.
The Mozilla Foundation isn't much better, but Firefox has a much larger following of people who spend their time combing through new releases for crap hidden in the code. When you can't trust any of the developers, go with the one that has the largest following of privacy nerds.