i3 kinda does this. It manages workspaces/windows/tabs. I use qutebrowser and it has the option of 'tabs as windows' so that i3 can handle my browser tabs. My u

i3 kinda does this. It manages workspaces/windows/tabs. I use qutebrowser and it has the option of 'tabs as windows' so that i3 can handle my browser tabs. My user experience is pretty consistant across my entire system. Firefox doesn't allow each tab to be a window, which breaks the consistancy but i only sometimes have to use that. But as has been mentioned, plan9 does this at a design level.