Rated 5 out of 5 stars

Very useful and simple addon. Does exactly what it says. I am also very thankful for the blacklist feature. One feature request though, could you put the number on the favicon, like this screenshot: http://img502.imageshack.us/img502/3092/ss20110218135044.png
This would save even more space.

This review is for a previous version of the add-on (1.1-signed).