I cannot live without this extension. Mozilla should consider replacing the default tab UI with this or something equivalent.

Great！Thank you for your work.

这提供了 Tab Group 类扩展替代品的 新思路：除了“身份标签页切换”和“虚假的打开关闭标签页”，
完全可以在侧栏自己做一个标签页栏嘛，然后就可以自由发挥啦。

开着侧边栏并F11进入全屏，宽屏笔记本表示不能更棒！

Tree Tab 很好地结合和大量 Tree Style Tab 的作者和第三方扩展。
比如通过鼠标滚轮（触摸板双指上下滚动也可以）切换标签页

Tree Tab 上的右键菜单是由扩展自己绘制的，
不像 Tree Style Tab 那样要先进入 Tree Style Tab 层级菜单才能下一步
不过 TST 那样或许可扩展性更强吧

目前的遗憾是：翻译（要安利给更多人w），对右键菜单自定义删减
Multiple Tab Handler 中多选标签页后包含更多功能（刷新、多种格式的链接复制、存为书签）

Amazing! Tab grouping is the great feature that I was in need of.

This addon is great for me since it has the option to scroll between tabs using the mouse wheel. Didn't realize how comfortable this option is until I lost it.

What would make this addon absolutely perfect, would be a shortcut button (F1 for example) or the ability to set it ourselves. Would be much faster to switch sidebars this way.
Plus, a built in dark theme would've saved me some time, and I'm sure there are many others who would've appreciated that. Although the customization options are very good.

2 tiny things that slightly bother me; Scrolling between tabs isn't smooth, it even gets kind of stuck sometimes + When I hide the groups on the side, it doesn't always stay that way (every time I restart the browser).

Other than that it's great. Greatly enhances my browsing.

EDIT:
Both of my major complaints were fixed. Great job!

Thanks for the add-on, it's priceless. I cant understand why developpers continue to use vertical space for all their crap when screens only get wider and wider. Don't they ever *use* their machines?

Too bad firefox does not provide the API to hide *their* tabs.

It is wonderful to realize tab group and tree tab with just one add-on.
I think it would be nice if you can reload the tab by double clicking and edit the tab name of Ungrouped tabs.

Why does it need to 'Access your data for all websites'?

Best replacement for the Old "Tree Style Tabs" extension

Requires access to ALL data from websites. Why?!

Even in just the past the month that I've been using this addon it's come along very nicely. The simple - Tree style tabs that work. Also - I love the new tab grouping feature set!

Much better than tree style tabs.

Looks like a great addon. Couple of suggestions:
- search should be able to search both page title & url together, doesn't seem like an option currently.
- some built in dark theme will be great, maybe some option to have a bigger tab button since the current click target is quite narrow

You did what TST had not done.

FASTER
SMARTER
MORE FUNCTIIONAL

This should be standard one.
You are great.

Good replacement for the TST. I would like to see the possibility to highlight not only unloaded but also unread tabs.

Great replacement for Tree Style Tabs. Make sure you add window:not([privatebrowsingmode="temporary"]) #tabbrowser-tabs { visibility: collapse !important; } to a file called userChrome.css in a directory you create called chrome in your Firefox profile directory if you want to get rid of the default tabs.

Used TST years, last night tried Tree Tabs new version on version 57, it is much faster than TST, and lots of customization options. Love it! Fantastic job Kroppy!

Super useful for work when you need to have multiple tabs and want to organize these tabs effectively!

F**k Yeah!
Vertical tabs, groups, and trees! Perfect!

Nice addon !
Testing it alternatively with TST on FF 57b ...
Promising ways to get rid of tabs above ...
Check this script to minimize the tabBar still more ... https://www.reddit.com/r/FirefoxCSS/comments/7512nz/minimized_titlebar_buttons_minimizemaximizeclose/

You have the sidebar and the tab bar so what's the point. Beside you can not hide the siebar whenever you want it get stuck there. It is annoying.