Workona - A better way to work in the browser.

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

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.

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

Tablerone - Browser extension for saving, organising, and exporting tabs. Save multiple tabs with one click. Get more done with a clean browser.

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