I would recommend using librewolf thorium for normal task and if the site doesnt work with it i use thorium. Librewolf is slower than thorium but it is for me the better default version of Firefox. Loading yt is really slow with librewolf so I use freetube or invidious to watch content.
I've tried installing thorium but I can't get it to compile correctly and I don't wanna sit there forever trying to get it working so I just gave up and installed chrome
So on their github are appimages, .rpm and .deb available. Idk if you can convert .deb or .rpm files to alpine compatible packages but the appimage should run eververe