TIL Firefox slipped in a feature to disable your privacy & security extensions on a list of sites Mozilla controls through some undocumented process: https://support.mozilla.org/en-US/kb/quarantined-domains
It can (and absolutely should) be disabled, but I'm quite concerned that there's no info on where the default list of sites (a bunch of Brazilian banks?) comes from and how they inject it to the browser. New hidden phone-home shit?