If you want that but on steroids, there are quite a few extensions for vertical tabs which allow grouping and much more. My favourite (after trying most of them

If you want that but on steroids, there are quite a few extensions for vertical tabs which allow grouping and much more. My favourite (after trying most of them) is sidebery. I think there are extensions for grouping the normal horizontal tabs as well, but IMO vertical tabs are a complete game-changer and well worth trying.