Great tool to structure tabs for tab-hoarder like me!
Only one thing could make this better - If the structure would somehow be saved when I use my "OneTab" extension.
If you could work with that developer to get that then this is worth 6 stars :)

Also I like the little pop up message about how how to hide Tree tabs and regular tabs in one step, I wonder if a similar annotation could show new users about the other TST additions/addons?

BTW- Maybe the Close 'Tree Style Tab' button should be a collapse icon (<) instead of (X), because that symbolises a non-reversible closing action to me.
(Version 3.4.8)