Rated 5 out of 5 stars

the best tree-tabs add-on

there are a few minor problems
* resizing misbehaves sometimes
* after Firefox restart some of the tabs get "resurrected"

new tab, list all tabs, and panorama button would look better if shown as a pinned tabs
also integration with panorama groups would be nice

This review is for a previous version of the add-on (0.10.2010111301).