I gave Firefox a try a month or two ago when people started saying it was good again. I think I had a problem with uBlock origin not working well enough - too much crap was getting through. What are people using for adblock?
I tried several times, but ended up sticking to a sandbox (firejail) + uBlock Origin + HTTPS Everywhere.
I thought of making a script that updates that file automatically, but I can't say I've seen any ads on that laptop even without updating the file for months, so hasn't been my first priority.