For tab groups, take a look at Sea Containers: https://addons.mozilla.org/en-GB/firefox/addon/sea-containers/ https://addons.mozilla.org/en-GB/firefox/addon/sea

For tab groups, take a look at Sea Containers: https://addons.mozilla.org/en-GB/firefox/addon/sea-containers/ https://addons.mozilla.org/en-GB/firefox/addon/sea-container... It makes use of the new Containers experiment to provide a similar tab organization mechanism as TabGroups, and presents them in a vertical sidebar which IMO makes for a much saner workflow for heavier tab users. The identity encapsulation that comes by default with Containers might not be what you're looking for in a pure tab management system though, but as Sea Containers shows, some variant of tab grouping can definitely be implemented in WebExtensions.