Rated 4 out of 5 stars

Me too... this (indispensable!) add-on just failed bigtime with the latest batch of updates. All-in-One Sidebar seems like the likeliest conflict, but even their latest beta (which actually mentions the problem) didn't fix it. However, reverting to the previous Greasemonkey did. Assigning blame is pointless... I'll just be glad when FF4 finally ships and all these issues start to go away again!

This review is for a previous version of the add-on (