@versel Oh, well, sorta Vivaldi Bis? Vivaldi Snapshot latest version is very interesting, indeed. Similar solution would be very handy using Opera.
It just happened I had to delve into other browsers issues in quest for more advanced features than Workspaces Opera offers.
Lucky me! 🙂
I've dug out the Simple Tab Groups extension for Firefox. De facto, it is the best replacement/supplement of Opera Workspaces I've ever seen.
Workspace ROLODEX
Every Group of tabs you selected removes current (opened) group of tabs (removes them, but keeps them!) and open new selected Group with its tabs. Imagine virtual Rolodex - you turn up or down a virtual electronic dial and every time you will get a new set of tabs!
That's what Opera lacks!
[Fig. 1] Screenshot from TSGextension page.
STG
[Fig. 2] How STG works on my PC in Firefox
sssx_0013.png