Tab Groups was moved to an extension, and has had a lot of nice improvements: https://addons.mozilla.org/en-US/firefox/addon/tab-groups-panorama/ https://addons

Tab Groups was moved to an extension, and has had a lot of nice improvements: https://addons.mozilla.org/en-US/firefox/addon/tab-groups-panorama/ https://addons.mozilla.org/en-US/firefox/addon/tab-groups-pa... A lot of folks use https://addons.mozilla.org/en-US/firefox/addon/tree-style-tab https://addons.mozilla.org/en-US/firefox/addon/tree-style-ta... Personally I use separate windows for separate tasks, so I can close a whole window when I am done with something (research, work, tabs from HN, etc.)