This is the best extension ever. I would also like to be able to hide the tabs at the top in Firefox 57.0.

Can't imagine browser without this addon.
The main reason why I'm still on FF.

Great extension. Don't know if it's possible with Quantum limitations to add an option 'Protect tab' (from accidental closing)?

Great extension, but in Firefox 57.0, the tabs are still shown at the top of the browser, taking up space – I hope this gets fixed soon!

This is probably the main reason why I use Firefox!

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.

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