@dangoodin if I was doing that switch I'd probably run with LibreWolf or WaterFox just as the most active of the Firefox forks. You want something that's actively and rapidly updated to address things like the recent zero day.
And to your point, @fencepost, I'm curious if anyone has written an article trying to assess the security (including timeliness of patches) of the various Firefox forks/derivatives. I've seen conflicting claims but have not personally delved into it. @dangoodin