You probably know but firefox on mobile let's you use extensions, for which i have ublock origin installed and regularly use it to block modals and things that my filter lists (every single one activated) don't cover already.
You can also install Bypass Paywalls Clean on mobile Firefox.
I've actually been meaning to move back to Firefox, so this is encouraging. I didn't realize you could do that sort of thing with uBlock, though? I thought it was just for blocking ads, etc.