[clum]

I've been using Tree Style Tabs for a long time now. The transition was rough, but I never want to go back. Tabs are grouped automatically (you can of course drag/drop them), everything is in trees and branches you can close them as groups and subgroups, reload, favorite a tree, restore a tree, move to new window and so on and so on. It's absolutely amazing.

[deathlight]

The transition wasn't rough to me at all. When I finally decided to give it a try it was like seeing the seas part before me. I can legitimately not go back to non tree based desktop browsing.