Power Tabs VS Simplified Tab Groups

Simple Tab Groups - Create, modify and quick change tab groups. Features:

Panorama View - Tab Groups with Panorama View. Lets you easily Group and manage Tabs visually, with tab hiding.

OneTab - Whenever you find yourself with too many tabs, click the OneTab icon to convert all of your tabs into a list. When you need to access the tabs again, you can either restore them individually or all at once.

Tree Style Tab - Tree Style Tab is an all-in-one Firefox extension that provides ability in order to operate tabs as a tree.

Firefox Multi-account Containers - Sign in to two different accounts on the same site

Tiled Tab Groups - Provides tab groups / panorama functionality using the tab hide api. Manage tab groups in a compact, tiled groups view.