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.

Stil buggy, open a link on a child tab and it will hide, despite disabling the option to not collapse the tab, this happens plenty of times, and it's annoying. Rarely happens but, sometimes the tab will just be out of sight, and have to CTRL+TAB to get to it. There should be a way of resizing them, they are too large for my eyes.

Still good tho.

Dev if you need a showcase, or a way to replicate the collapsing issue, go to the Tree Style Tab extension page (https://addons.mozilla.org/en-US/firefox/addon/tree-style-tab/) and go to More extensions by Piro (piro_or) and middle click in one of them, make sure there are no other child tabs, otherwise it won't work.

Auto-hide was the most remarkable option in this expansion. Now this expansion has lost its significance for me. I beg you to return the necessary property of Auto-hide.

Автоскрытие было самой замечательной опцией в этом расширении. Теперь же это расширение утратило свою значимость для меня. Очень прошу вернуть необходимейшее свойство Автоскрытия.

- doesnt work on the last stable version of Firefox, ver. 56
- in ver 57 there is a number of differences with regular behaviour:
cant make the tree style tab smaller than some limit, which is too large for me
top line tabs are not removed (what is then the point of having this extension?)
Hope the extension owner and the firefox team will fix bugs fast. without this extension there is much less reasons not to go for Chrome

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。

Great extension, have used it since I discovered it some years ago. I love that it is still being worked on and updated!

Using with Firefox Developer edition, the Firefox 57+ version is pretty good. I'm used to having bookmarks open on the left side and tabs on the right, which doesn't look possible anymore, but I can adjust. The one thing that *really needs to be an option or default* is getting rid of the default tab-strip on top like the old extension did. It would be most preferable if it just showed the title of the tab you are on, like the old extension did.

I can't live without this extension, so I'm putting up with having a tab bar on top AND a tab bar on the side, but that is definitely sub-optimal. I see there's a way to disable the tab bar on top with a "chrome/userChrome.css" in the Firefox profile folder, but I'm on the fence about showing nothing up there (most prefer title of page).

This is a new version so some bugs are expected, hoping for the best, and thanks to Piro for this great tab organizer.

You can disable the horizontal tabs on the title bar by adding the following line to userChrome.css in the Chrome directory of your Firefox profile: #tabbrowser-tabs { visibility: collapse !important; }

If you don't have the Chrome directory and userChrome.css, make them. Go here for information about how to access your firefox profile: https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

I hope Piro-san will solve this in a smarter way.
And Thank you so much for your hard work. This extension is the reason why I never switched to other browser.

I am addicted to this extension since 2.5 years and suddenly firefox updates screws it. It is showing tabs in both horizontal way and tree style. Now I am stuck with a weird looking UI. Had to disable.


PLEASE REMOVE THE OLD WAY OF SEEING TABS. FFS

It shows the old tab view AND the tree style tabs at the same time when using it with Firefox 57. I had to disable it, but I'd really like to use it again.

Used with Firefox Dev build: I really enjoy this add-on. I love the premise. Stability seems iffy: (1) I sometimes observe the parent tab separated from its children, i.e. there will be tabs in between the parent and the child at inconsistent depths; (2) I have observed once in the first few hours of using it the whole sidebar becoming blank and unusable, requiring a restart. I also have one suggestion: I find that this add-on simply supersedes the vanilla browser tab strip, so it would be nice to have an option to hide the default horizontal tab strip.

amazing! please keep it updated!