I am currently a LibreWolf user, but I am also aware of Arkenfox User.js, which I am led to believe offers similar features.
Which is better?
From the creator of arkenfox.js
AF (arkenfox) vs LW (librewolf) AF enables SB (safe browsing) and uses mozilla’s API key. LW doesn’t have a SB key (edit: note AF does block real time binary checks) AF updates same as Firefox. LW has no updater in windows AF can use any language, LW is limited to en-US AF restricts cross-site referrers by default LW ships with uBO - AF users have to do that manually and add/flip the two recommended filters as per the AF wiki So basically everything you see at Arthur’s independent test site at https://privacytests.org/ for LW applies to AF along with referrers (navigational) with a green check as well