This addon add a "Dislike" feature on facebook.
Watch screenshot to see it in action. ;)
To select language : Tools > Add-ons > Facebook Dislike 1.0 > Preferences
"How to" YouTube Video : http://www.youtube.com/watch?v=UAM_PdS4vaY
Facebook fan page : http://www.facebook.com/pages/FBDislike/186845260403
Send Translation in your language here : http://www.facebook.com/pages/FBDislike/186845260403