Rated 3 out of 5 stars
It doesn't look like Firefox 4 compatibility is going to come anytime soon. All hope is not lost, though. There is a stylish for it! I can confirm that it works with RC Build 1. Here's the link. http://userstyles.org/styles/29428This review is for a previous version of the add-on (5.0). This user has other reviews of this add-on.