A great next iteration would be to let users fold/unfold those groups, so that you only have one visible "tab" per group in the top bar.
This would really help the "tab collecters" (like me, who had to close 78 tabs some weeks ago).
This would really help the "tab collecters" (like me, who had to close 78 tabs some weeks ago).
If they add the ability to collapse groups, then I would probably use it, otherwise I can keep my tabs just as organised without a need for some colour hints.