I happened across a thread on Lemmy recently that discussed the usefulness of certain extensions, and this “Don’t Bother” section of the Arkenfox wiki was linked:
A lot of conventionally useful extensions like Privacy Badger, HTTPS Everywhere, Decentraleyes/LocalCDN, etc are apparently not necessary (at least in Firefox) if you have certain browser preferences selected, like Strict Mode/Total Cookie Protection.
I felt outdated cause I still run Privacy Badger and Decentraleyes in my Firefox environments, but it was nice to see that a lot of these “extra” features that used to require extensions are now options built into the browser (or Firefox, at least).