Excellent... except for transparency. Rated 4 out of 5 stars
This add-on is perfect save for one major flaw: the transparency. When you have auto-hide (or auto-shrink) enabled, the background behind the tabs becomes translucent. More times than not, this means that you can't read the title of the tabs.
An option to disable transparency would make this a five star add-on without question. Please consider it!