As a long time user of Opera (from before they went with Chromium), I've been using Vivaldi as my primary browser since they first released a public preview. It has its downsides (i.e. the UI is slightly slower than that of Chrome), but at the same time it's the thing that feels most "at home" for me after migrating away from the joke Opera has become. The developers seem to hold a strong anti-manifest-v3 stance, but unfortunately at one point they might have to comply. I just tried the built-in blocker instead of uBlock Origin I normally use and it seems to do a pretty good job.

I get the whole "switch to Firefox" thing; for me the major blocker is that it doesn't have global mouse gestures and this messes up with my muscle memory. If they add that, I might give Firefox another chance.