very nice start Rated 4 out of 5 stars

It seems (and looks) really nice. All I miss is the ability to put the tabs on the right side of the window. (Mainly. ;-) )

And a few behaviors are missing (IMO) :
- hide in fullscreen mode;
- hide on popup windows (e.g. when composing a new message in a separate window on gmail);
- and tabs opened FROM a group should stay IN the group (seems more logical to me).

So all in all, not as powerful as Tree Style Tab, but at least it works with FF4. :-)

This review is for a previous version of the add-on (0.7.2).