Go to about:config and type groups, it’s being actively developed.

There’s also another API that you can actually use if you’re a developer in Browser Toolbox, enable Browser Toolbox and type gBrowser.addTabGroup, you can add tabs to group using this API, and if you find a way to append it to Tab Tray you should be able to create something like this image:

  • FriendBesto@lemmy.ml
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    4 months ago

    The implementation of vertical tabs pales in compared to Sideberry. Nice that it is heading in that direction, though. Plus, there is still Sideberry.