Problem Rated 4 out of 5 stars
It has a problem, at least in firefox 25. It disables the close (X) buttons on the tabs, instead there is only one close button on the right side of the screen, which can close the active tab only.
However it was a great addon, to correct the mozzilla's annoying decision to remove the feature, what this addon brings back.
Screenshot here: http://picpaste.com/K__perny__k__p_-_2013-11-23_-_12.38.15-KTenuwri.png