This extension blocks faces and selfies.
This extension blocks "faces" on Facebook by putting a image of an Awesome Smiley on them.
Drop that stupid duck face for a nice, smiling selfie.
Seriously, who likes selfies on Facebook? We have Instagram for that.
Use FaceBlock to get rid of them.
P.S: Yes, although the extension works, this is satire - the developer does not truly hate selfies.