This extension is the USP of Firefox and the reason I still use this Browser! Thank you so much Piro (piro_or)...

Tree Style Tab is my first reason after security and privacy to use Firefox. I really can't imagine browsing without such an extension. Great job, Piro!

the best tree style tab extension I've tested so far!

Switched back from chrome to firefox just to use this addon. Very valuable, great way to organize tabs for people like me, who have multiple sudden ideas scattered around and like to group those ideas in tree styled tabs. Too bad it's a bit glitchy lately - sometimes child tabs don't want to be attached to parent - for some reason they appear in different places, yet they seem to be still related. Reopening browser helps.

Thank you for this addon!

Neat design! Improves the Firefox user experience.