Useful, polished, heavily customizable. Overall an amazing extension.

This add-on made me change my entire browser experience, once and for all.

I was fighting with tabs for so many years. Constantly having a multitude of open tabs, fearing accidentially closing the window.

I was not very productive, having to scroll and look for tabs all the time.

This add-on was recommended to me, and while it did take some getting used to, I was finally able to conquer the vertical tabs.

Now I've move on from Tree Style Tab, to the more powerful Sidebery, but this is what made me do the jump.

Piro is a tab GENIUS

Thank you for your tireless work fighting AMO failures and mozilla defects

If I had to choose only one addon with my Firefox, it would be Tree Style Tab.

love it!

SUPER.Ein echtes must have.Vor allen Dingen auf dem Laptop unverzichtbar.

I've been using this add-on for a few years and it helps me navigate the many tabs I tend to have open in my windows. I've never had a problem with this add-on.

Nach uBlock Origin die zweite Must-Have Erweiterung! Funktioniert top und hat unglaublich viele, sehr nützliche Funktionen!

Nicely takes the tabs to be stacked vertically on the left. With additional custom styles applied to the browser you can also hide the tabs in the title, so your browser has just the address bar on the top (and window buttons if on Windows), unfortunately this isn't supported in the extension itself out of the box but has to be done separately.