This entire thread reads like a game of cat-and-mouse. People trying to block intrusive ads, and FB reaching into the depths of code and making it nearly impossible for anyone to do so en masse.
I've been there. Tried to uncheck all the boxes on their ad platform; used all manners of ad blockers, etc; used incognito mode; used Tor; etc. etc. etc.
At some point, you realize that the only way to not get served ads on Facebook -- and thereby not benefit the company itself -- is to get rid of it completely. Delete your account, get off that blasted site, and enjoy some moments of peace IRL.
Having been a very early adopter of FB (since ~2004), I deleted my account and am clean + sober + much happier since 2016.
(Not to say that I'm completely out of the FB ecosystem. Unfortunately, my fam is still on WhatsApp... and I've been trying to convince them to migrate to Signal...)
YMMV