It's just firefox. If you encounter websites that break or look bad on firefox, theyll be just as broken on librewolf. There are many web standards firefox is behind on.
That said, vivaldi is the best chromium choice and Librewolf is the best FF choice. I use librewolf when adblocking is paramount, like on YT
Why is it important that OP pretend like they dont approve? This is a puritanical take with a particularly dim view of sex.