Librewolf is essentially Arkenfox but as a browser instead of a user.js. You may gain more privacy but at the expense of potential site breakage. Betterfox is

Librewolf is essentially Arkenfox but as a browser instead of a user.js. You may gain more privacy but at the expense of potential site breakage. Betterfox is for everyday use cases and should rarely cause site breakage. It also has prefs to prevent annoyances and improve browsing speed.