Re: Problematic?
Just tell your mum if it doesn't work its not secure for her to use. I'm sure she can find other sites with the same content that don't insist on following her around the web like a creepy stalker.
I've been blocking 3rd party cookies since the 90s and block more trackers than FF and I don't have many problems. Of course I don't use any Facebook products, I imagine they would be borked to hell and back in my browser.