Rated 4 out of 5 stars
After tab bar became a toolbar in 3.7a4. Add on stopped working. Worked great before that.This review is for a previous version of the add-on (1.4.3).
New version 1.4.4 Works again in Minefield (Firefox alpha) 3.7a4pre ! :-)
... (working again after an internal structure change in 3.7a4)