No problem, glad I could help!

Tbh vanilla Firefox + uBlock configured as advised in that user.js wiki page linked above is more than enough.

Librewolf is preferred but it's something you need to follow and be aware of. It's an indiependent fork of a browser, and as such you really don't want it to be discontinued without you noticing.

Which is why I would advise librewolf over Firefox only if you know you'll stay updated about the privacy "scene", if you're setting it up on someone else's computer, on a work device or you just want a "set it and forget it approach", definitely go with vanilla Firefox. Again, 80/20 rule.

About Arkenfox's user.js I remember reading it was meant to be a starting point, not to be used as it is provided but to be customized for it to suit your needs.

Personally I always thought it was not worth to invest the time, but I guess it's a good learning experience if you're interested in it.