Fennec, basically Firefox forked. uBlock Origin + ClearURLs. In uBlock Origins I have every single filter enabled except the language ones. Also dark Reader is nice and synced with my system theme, something that doesn't work in Mull because fingerprint resistance blocks that by design.

I can't do Mull for day-to-day stuff, too many things break for me. Web apps like my work stuff, financial stuff, medical stuff, all those heavily use JavaScript and aren't the best coded so they don't like Mull very well. Fennec with uBlock Origin "just works" and very rarely do I ever have to turn off uBlock, usually disabling cosmetic filter on it fixes all my problems.

Also if you run a Firefox variant, you can enable NoScript and enable "Temporarily set top-level sites to trusted" and it will enable a lot of js websites to work without tweaks while still offering very powerful protection.

If I website doesn't work, opening it I'm Vanadium is a nice way to check if the issue is Firefox or not.