When I killed my Facebook account a few years ago (before I went back a couple of years later) I didn't realize how intrusive FB was in my life. Imagine having no account there, yet most of the pages you land on show a little fence icon on the page. Boom! That was FB tracking you, a non-FB user.

Even though I have Privacy Badger, I kept this one. They don't fight over blocking FB tracking. I totally love this add-on.