I use Facebook login for some sites (like Patreon). I understand that Facebook will receive information about my activity on those sites and I've accepted that in return for the benefit of one less credential which needs to be saved. Unfortunately, this add-on makes it difficult (if not impossible) to use this feature, even on an opt-in basis.
I'll be keeping an eye out for updates which allow for more control over the behavior of the add-on and I'll try it again at that time.
