FAKE, AVOID! Rated 1 out of 5 stars
Facebook is full of fake events, and fake profiles. All they do is to advertise, by installing apps and such you are allowing them to post on your profile wall and your friends profile wall. Facebook's policy DOES NOT allow people to know who views your profile for privacy reasons!, everything about who views your profile are fake.This review is for a previous version of the add-on (2.60).
Please, next time try the add-on before writing a review.
It is true that Facebook developer policy does not allow such behavior, but you miss that this is NOT a Facebook app, it is a Mozilla Add-on.