Just wondering if there is an add on similar to fPrivacy for Chrome available for Firefox?
How To Remove, Block & Unblock Facebook Applications
check this also if you like it. Didn't tested myself
The Priv3 Firefox Extension
I've never used either, but some websites are mentioning FBSecure as a similar extension:
I have yet to find a Firefox extension that serves the same purpose, but you can still do the same thing by going to Facebook -> Account Settings -> Apps and editing the permissions of the applications in the list.