This is the best add-on on firefox. Everyone's lives would be better if they used tree-style tabs. I am a tree-style tab evangelist and the add-on is the primary reason that I use firefox.

Tab power at your finger-tips

Tree Style Tab is the main reason Firefox has been my default browser for the last several years. It is hard to believe that Firefox--nor any other browser from Chrome to Edge to Opera contains native support for these style of tabs. For any user that like to have more than 20 tabs open at a time, I find this to be essential. Absolutely the best browser feature, I just wish I could figure out a way to make a monetary donation to the developer!

Great addon! Without Tab Groups it is a lifesaver when working with lots of tabs.

All the issues have been fixed! Flat out, this extension is the main reason why I use Firefox, I can't stand Tabs on top; they are a mess when there are more then 3 open tabs! No other browser handles tabs on the side well. Chrome's similar extensions are all horrible. Edge and Vivaldi don't handle "tab children" the same way and you can't tell what tab a new tab is from if you do "Open in new Tab".

And then add in all the other addon Extensions that Piro has made for TST, it can't be beat.

I utterly fail to see why this sort of thing isn't just an option for ALL browsers. I guess it just shows how technical of user I and others that need something like TST are.

ko

Best of the best. I was looking for something similar, very pleased with the result. We just have to wait to hide the tabs at the top ((
upd'2024: ... and search in opened tabs by caption please ))

tes

My favorite and most used Firefox plugin. Increases my daily productivity and ease of mind significantly. Also the main reason why I stayed with Firefox for years (even though Chrome was and is very tempting). The overhaul update of this plugin which now supports Firefox full screen mode on Mac OS and got rid of all other bugs I noticed before is stunning! Love it!

很喜欢这个扩展。

It's come to be an essential extension for me. With the death of tab groups it's the next-best-thing. I only wish that there was a better way of creating group folders (dummy tabs).

Edit 2020-04-30: Still loving it

方便整理各式各樣的網頁，可以一目了然網頁之間的關係

Must install add-on

This extension is super easy to use. I love it!!!

Dhvhggjj

Tree Style Tabs is indispensable, and I'm so happy you got a WebExtensions version in time for Firefox 57+.

The latest version seems to have a bug where the tabs don't always update (eg. new tabs aren't shown in the sidebar) but it was working great before this version. Been testing this since the first WE compatible version was released.

great way to create semantic relationships between tab groups

Problem with FireFox Quantum.
It is not possible to display two panels, left and right at the same time.
In the previous version firefox (56.*) it was possible to display bookmarks in the left panel and on the right opened tabs at the same time.
Now, in FireFox Quantum, only one panel is available, left or right at one time. Open tabs are displayed at the top and do not depend on whether the Tree tab is enabled or not.