Well made and more usefull than you might think before :)

great addon !
keep going ;)

its good

I tried the latest version because it looks like a useful extension. I discovered that it would completely reverse the order of the tabs I open with Morning Coffee Quantum, even if I disable all Tree Style Tab's control settings over new tab placement. Eventually I removed the current version and installed v3.9.22 as was suggested by some reviews on this site. It now works correctly, so I will stay with this older version.

Hands down the best browser extension I've ever seen, and the constant development & helping resolve issues is outstanding.
Thank you for all your work.

This extension has been great for a very long time. Easy 5 stars.

The latest update has made it borderline unusable though.
How do I create a new tree? It seems to be completely random, sometimes they just pop up. But dragging one tab onto another seems to be impossible.

In past times I even removed the builtin tab bar. Right now I am seriously considering to remove the addon until the situation is fixed.


EDIT: I have briefly seen, how it's supposed to work. That is all fine.
But there seem to be major bugs right now. Most of the time, like described above, it's not possible to drop a tab onto another tab to create a tree. Also there are super weird interactions between page content and tree pane.
I have disabled the extension for now. Hope to see it back in former glory soon.

In my opinion, this is one of the most important Firefox extensions.
For years, I have been using it daily, along with several of its associated extensions.
In the course of the extension's evolution, bugs have arisen but they are a sign of Piro's (its author) constant effort to improve it and he has promptly solved them.
@Piro, thank you very much for your work and your generosity.

All 4* versions, unfortunately, are the worst and impossible to use - they are very large and have many problems. For example, CSS styles of trees is completely destroyed and many other troubles.
I'm staying with version 3.9.22 and hope the author will fix anything that's broken in future attempts.

С 4-ых версий всё поломано и пользовать невозможно стало. Вернулся на 3.9.22 и отключил автообновление.

firefox keeps crashing after installing the extension.

I love this add-on! The organization!! "chef's kiss"! If you are looking for some input requests or ideas, I would ask that you make the child, sibling, and parent options more accessible, like from right click or some other button as apposed to the hidden button next to the plus sign at the bottom. Thank you for creating this add-on! It has done wonders for me in my need for organization.

Indispensable part of using Firefox. The developer is very active and understanding. Great job!