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:

  • boerbiet@feddit.nl
    12·
    2 months ago

    As a user of the old Opera browser back in the day, I cannot express how much I have longed for this feature! Really looking forward to this 🥳

    • jangdonggunOP
      2·
      2 months ago

      Yep, waiting for this feature so userChrome.js cook-ers can turn it into Tree Style Tab Group like Sidebery, with this config exposed it would be surprised if it takes long for us users to try the test version.

      Smart Tab Group is pretty hype too.