This extension stops Facebook from tracking you as you surf the web in Firefox; however, this extension does not prevent facebook from tracking you to other sites when clicking on a link posted on the facebook website. The Facebook link-shimming server (l.facebook.com - that's a lowercase L not a captial I) circumvents this container by injecting new copies of Facebook cookies and locally stored objects (LSO) into the newly opened container, tab, window, or even a completely different browser prior to being directed to the link you think you are going to directly.

Installed it and for some reason images in Twitter don't show. Disable and refresh and they show again. Must be affecting it somehow.

yep, same as a few people, i can't log into facebook any more. not seen any support available for this issue either.

It certainly did a good job of containing facebook - It logged me out and then prevented me from signing back in again. Even after disabling the add-on.
So I guess it depends how much you like facebook. Or if you want more free time and an enforced social media detox...