Lightbeam for Firefox - Mozilla is the not-for-profit behind the lightning fast Firefox browser. We put people over profit to give everyone more power online.
Simple Tab Groups - Create, modify and quick change tab groups. Features:
island - a free and opensource alternative to parellel space
Panorama View - Tab Groups with Panorama View. Lets you easily Group and manage Tabs visually, with tab hiding.
App Cloner - Clone your Android apps so you can use multiple logins.
Tree Style Tab - Tree Style Tab is an all-in-one Firefox extension that provides ability in order to operate tabs as a tree.