Simple Tab Groups - Create, modify and quick change tab groups. Features:
Plantyflix - Watch Netflix and plant trees
Panorama View - Tab Groups with Panorama View. Lets you easily Group and manage Tabs visually, with tab hiding.
Treeapp - Plant a tree for free, every day, in less than a minute
Tree Style Tab - Tree Style Tab is an all-in-one Firefox extension that provides ability in order to operate tabs as a tree.
TreeMapper - TreeMapper is an easy-to-use tool for standardized on-site data collection on forest restoration.