about:config and search toolkit.telemetry.enabled I checked on a fresh 83 and its greyed out.

You need to create the file firefox.cfg in install Dir and enter lockPref("toolkit.telemetry.enabled", false); To override it And to get that to work you need to create /defaults/pref/autoconfig.js with pref("general.config.obscure_value", 0); and pref("general.config.filename", "firefox.cfg.js");

Its getting harder and harder to make a good browser out of FF, I personally don't mind the work, but things like Lockwise replacing a working password manager without the needed options and no addons to fix it or workarounds, i can see it messing up fields in PasswordFox but can no longer do anything about it.