This is the mother of all "killer apps" for all browsers. I've used tree-style tabs for years now, a great surprise that it was updated as a webextension. Firefox Quantum + tree-style tabs feels like the future. Bravo Piro!

That extension is one of the reasons why Firefox is so awesome! Thanks a lot for updating it to work with Firefox 57!

Hopefully the issue with an API for hiding the native tab bar will be resolved soon.

This is the most useful addon in the history of Firefox. As long as this addon is alive, I can't leave Firefox.

Very good extension, highly customizable.
If you want to hide the legacy tabs toolbar AND the title toolbar too, here are my settings :

* Disable title toolbar

* Tree Style Tab vertigo theme

* In your profile/chrome/userChrome.css file (create it if needed) :

#TabsToolbar, #sidebar-header {
visibility: collapse !important;
}
#TabsToolbar {
margin-bottom: -23px !important;
}
toolbar {
padding-right: 110px !important;
padding-bottom: 2px !important;
padding-top: 2px !important;
}
#navigator-toolbox::after {
border-bottom: 1px solid #474749 !important;
}

I like thin and clean tabs so I added these rules to the Tree Style Tab extra style rules :

* Custom Tree Style Tabs css :

.tab {
height: 25px !important;
border-top: none !important;
border-bottom: dotted 1px #ccc !important;
}

.tab .label {
font-size: 11px !important;
}

And voila, a single bar clean Firefox (tested on developer edition v58).

Just one feature request : a dark (not black) theme using the same grays than Firefox would be great !

Oh thank god the developer got this to work with the WebExtensions version of Firefox. I've been dreading the thought of losing this extension for about a year or so now, as I rely heavily on it for productivity. I don't really know what I would do without it - I guess I could have adjusted to Vivaldi's vastly inferior side tab system instead. But now there is no need!

Also, to get rid of top tabs as well, use this workaround: https://www.reddit.com/r/firefox/comments/721ieq/ff57_removehide_tab_bar/

And then go into Customize settings, and at the bottom check 'Tab Bar' to get back the top corner options.

大量にタブを開いていると、ハングし、
Firefoxを再起動すると、一部タブが「新しいタブ」という名前に変わり、
以前開いていたページが開かれなくなるバグが何度も発生しました。

amazing! please keep it updated!

The best way to organize your tabs! Powerful yet lightweight on system resources.

Ty so much for rewriting this as a webextension!
Performance amazingly now <3

Adds a panel to the left. Background-tab links are opened as tab children. Has drag&drop to move tabs around. Specific display for pinned tabs. Does not hide the tab bar, so right now, I'm using it with full-screen navigation. One of the best tab management add-on, comparable to OneTab.

Makes better use of wide screens and shows more context.

Does what it says on the tin, no useless or overcushioned functions. Supports WE, and makes heavy-tab browsing much easier.

What's best is that NO other browser or extension can do this. Only TST can.

Very nice addon quite useful to manage tabs.

F1 is a nice shortcut ... but I prefer personaly F4 ... is there a way for me to change this somewhere ?

I had a look and found "F1" in the manifest.json ... (opened it with 7zip) ... but changing this just breaks the addon ...
So ... Please, tell me how to do this ...

Great addon but sometimes stops working. A restart will make it work again, but tabs and windows that I'd closed appear again. Real weird. Was fine until latest update, and I'm sure it will be fine again.

When working it's a useful addon and when devs have the ability to hide the top tab strip, we'll get a little vertical space back. Trees are great, too.