[Sidneys1]

Stardock Groupy adds this functionality to Windows, and Microsoft briefly toyed with the idea themselves [1].

[1]: https://www.zdnet.com/article/microsoft-windows-10-testers-w...

[notpushkin]

I've used some third party tool on Windows, too. I've even tried disabling tabs in Firefox so that I could mix and match the “native” ones, but it didn't really work out.

Good times!