Works great in combination with TabGroup Manager! Rated 5 out of 5 stars

Superb addon!! I am using it in combination with TabGroup Manager. The groups represent different topics like, surfing, project1..n, news etc. and Tab Kit then organizes the groups as a tree.
Only thing not working in this combination is, that the collapse state is not remembered when switching groups. Unused groups can easily be hibernated with the TabGroup Manager. I have 200+ Tabs open without loosing the track of even one. Thanks!!

This review is for a previous version of the add-on (0.5.6).