Simple Tab Groups - Create, modify and quick change tab groups. Features:
Tabs Outliner - Next Generation Session, Windows, Tabs Manager and a TooManyTabs Solution That Really Works.
Firefox Multi-account Containers - Sign in to two different accounts on the same site
Tab Utilities - Tab Utilities is an ultimate tab solution for all kind of users who want to manage their tab, create multiple session and search for new tabs, etc.
Panorama View - Tab Groups with Panorama View. Lets you easily Group and manage Tabs visually, with tab hiding.
Undo Close Tab - Reopens the last closed tab.