Rated 3 out of 5 stars
I keep clicking dislike but nothing happens :) i love the idea though
edit: only version i can find of the addon is Facebook Dislike 1.3.3.sdk.1.1
On which version?
Update to the latest version 2.0.1 (due to new facebook change old version can't work).
Edit : version 2.0.1 is now approved by mozilla.