One little detail is annoying : when clicking on a priviledged (=facebook-considered) link from a non-priviledged page, or vice versa, the tab is replaced with a new one, in the container (or outside, respectively), with all its history wiped. And by that, I mean that the data stays in firefox's history, but the "previous page" button gets disabled and the related tab history is cleared.
This is quite annoying, as you have to be really careful and open links in new tabs if you don't want to lose your current tab and its related history.

Also, data from this module is editable via the Multi-Accounts Container module, including the color of the Facebook tabs - which actually glitches in this case, and allow you to change it but not to return to the original color... which is reverted when firefox is closed and opened anew.