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