Understanding how Firefox tracking protection works is one google button press away.

If you tell me that the OP had the time, patience, and technical skill to list all those possibilities but could not do a basic check on how Firefox tracking protection works, and instead talks about how with Firefox tracking protection "plenty of honest parts of the internet would break", and how blocked domains are used "sometimes for legitimate non-tracking purposes", forgive me for not buying the "openly unsure" claim.