Sorry, I don’'t have a full answer, however Safari is much more privacy focused than Chrome, and as you have a Mac you could use it. I’m on FB solely to send birthday greetings, so several times monthly, and have not had any such invasiveness. However, I do get warning messages from FB that “this browser is not supported” (latest Safari btw) although it is doing everything I need it to but clearly not everything they want it to ;-) If you do not receive a full answer here try Reddit which will certainly provide one.
PS We here are either all old duffers or old-duffers-in-training I think ;-)