Useful, Professional look, customizable and supports 3º party addons.

There is something weird compared to other vertical tab managers and is that there is no filter bar. I hope that there will be one in the future in TST or as TST's addon.

I got a notifcation about "noticable changes to Tree Style Tabs" that said "click here to read about it", but clicking the notification did nothing.

And then all the tabs became suddenly un-styled.

Version 3.5.17 removed both of the dark theme options. I refuse to use a light theme, & so reverted to Version 3.5.13 (the latest predecessor).

Otherwise the extension is pretty cool.

Absolutely love this extension, however it says I can't add it to firefox because it's corrupt. Any suggestions?

長らく愛用させて頂いてます。
　タブのスクロールバーだけをタブの右側に配置する設定ができれば、大変嬉しいです。
　タブは右側に設置していますが、ツリー構造は左側にあるときと同じ形が好きです。この場合、ページのスクロールバーとタブのスクロールバーが並んでしまい、操作のときに混乱するのです。ご検討いただければ幸いです。

With a tab search it'd be perfect.
And maybe an option to hide the native FF tab bar.

excellente extension

Close button on tab doesn't work with latest (3.4.1) version.

nice addon!!!!!

Can I disable notification in the lower left corner?

NOTE THIS EDIT: I just noticed configuring TST and following it's advice of changing configuratin 'browser.tabs.multiselect' to true, but it didn't exist! This is 77.0.1 64-bit Linux version and that option didn't exists - I added it, but as it was not there to begin with, I doubt it will be of any help that I added it... Advice?
-- EDIT END --

Awesome! I used to love an old legacy add-on called Tab Mix Plus, which really is an awesome add-on for the tab bar, but now I love the tab tree much more - it's also specifically nice with small netbooks, like my Acer Aspire One D270 (old, I know, but still works marvels if not put under too heavy strain), that have a widescreen display and very low vertical resolution - you can hide the sidebar if you need to, although most of the time it's not a problem, and you save the height of the tab bar in vertical resolution available to show the actual page. With such small displays it really does matter a lot.

Edit: Many people are complaining about the lack of search function. I'm not sure what exactly they mean, I'm completely satisfied with being able to search tabs using the location bar - you can enable this from FireFox settings. However maybe a search function that only shows the matching tabs (and the tab-tree they are part of) in the sidebar - when it's empty it would show them all. I can't think of another way they mean, but I'm really fully content with searching for the tab using location bar anyway :)