Wondering for built-in "Tree style tab" or Chromium "group tabs"

[mr-cheff]

What feature would you like to see?

I'm just tried the zen browser and loved that built-in vertical tab, but if there are something like built-in Tree style tab or group tabs, it would be perfect:)

What platform are you seeing the problem on?

Windows

Additional context

No response

~ Created automatically from issue: #231

[GitMurf]

FYI see here for a Discussion one of the maintainers opened up to follow this development: #891

[guigirl42]

#891 (comment)