I love it, it really changes the way you use the browser. If you have a ton of tabs it's so much more organised and you can have lot of tabs for different projects and not get lost.
Though I would love it even more if there was an option to save a tab group for later and easily restore it. Thanks for making the addon and hopefully you can add this feature sometime :)

I adore this addon and have no complaints whatsoever!

Good old gem. Use TST+UserChrome+ TST AddOns where you cannot update Firefox for some reason.

Sorry to see it go: +6 years ahead of its time!

Great extension while it is running, but each time the firefox is restarted it's a pain because all tab hierarchy is broken.

Need a feature to auto-backup and manually save/restore tree.

Très pratique

Feature-rich; lots of options to customize your workflow. Really excellent extension.