Sorry, but this doesn't actually do anything. Using beforeRequest there is no guarantee that your script will be loaded in time to block the request, so in practice you only end up blocking facebook trackers about 50% of the time.
The webRequest API will fix this when it is released, but for now this extension does not do anything.
If you are using Firefox, Opera, or Safari you can use the Ghostery extension which does this and blocks a few hundred other trackers.
I agree with the general sentiment of more respect for the users privacy. However, if you don't block all facebook social widgets completely, facebook will receive that information anyway and then this just seems like an inconvenience. Right?
Right now everything loading from the facebook domains (facebook.com, facebook.net, fbcdn, connect.facebook.com) are blocked. Then the extension allows the like button to work when a user explicitly requests for it.
You are right that only the like button among the Facebook widgets is implemented. This is just a very start, we can progressively add more features.
Really nice idea. Sounds like an easy interaction to enable the buttons as well when you actually want them. Although FB is by far the most prevalent and dangerous in my opinion, it would be nice to have G+, and Twitter controls as well.
Seems like a smart project, but I think they should change the image: With Heise facebook didn't agree to the modified like image, and I guess here the same will apply.
The webRequest API will fix this when it is released, but for now this extension does not do anything.
If you are using Firefox, Opera, or Safari you can use the Ghostery extension which does this and blocks a few hundred other trackers.