this plugin should be default in all browsers. Unfortunately it doesn't work well with last versions of Firefox :/ it's slow and doesn't look as good as before. But because it's been awesome until now it still deserves 5 stars. I just wish Firefox would put more effort to support this first class plugin.

If I can't use it in FF57, I will switch to Vivaldi. Have used FF since Phoenix 0.6 so this would be traumatic.

If chrome had this, I would be using that browser. I can't find any way to donate to you, do you have a donation page somewhere?

Very nice add-on. Once you're used to it, you do not want to go back.

Ну наконец-то, свершилось! Не глючное и быстрое дополнение древовидных вкладок, качественное визуальное оформление. Автор божественнен!

Tree style tabs is an absolutely essential browser add on for me. I can't thank the author Piro enough for all the YEARS of keeping this up to date and now that he's even supporting Firefox 57 I'm just amazed. This feature should be a part of Firefox's core experience. It's the biggest differentiator between FF and Chrome and it's why I will open often upwards of 200 tabs (I'm not exaggerating) without issue and keep those trees of tabs open for weeks as I work through certain issues and only close them when I'm ready to move on. In fact, Tree Style Tab removes the need for Bookmarks as it saves not only the page but the trail of history that led you there. I will often Google a topic and then control click the first 6 links then go through the tabs closing the links that aren't helpful. It's a huge time saver and just works in a way that really clicks with me.

Perfect add-on! Using it for years...
Also new webextension version is working fine (in FF57 beta)
Would be nice if one could disable showing standard tabs..but as on could read e.g. on https://news.ycombinator.com/item?id=15342379
new API doesn't allow it yet (workarrounds for this could be also found in link above).
Another point which would ad the "icing on the cake" would be a possibility to show number of open tabs in the addnewtab field below last tab. This would help to be reminded when it's time to close some...

I used to say that I would never move to Chrome because of Tree Style Tab.
I eventually did because some sites were becoming unbearably slow in FireFox. But I have always missed Tree Style Tab. And I would occasionally use FireFox for specific task so that I can use Tree Style Tab.
You've done a great work rewriting TST to support FireFox 57! Thank you! I'm back to FireFox now.

Testing it from now on. So freaking great you developped a « Tree Style Tabs » web extension alternative. Thank you man :)

Either crashes or intentional closures.

Awesome otherwise.

Someone already said it, but it's worth repeating. This is an essential add-on. Instant compatibility with Firefox 57 is greatly appreciated!

This makes Firefox so much better.
Must have if you have many tabs open. The ability to control the tabs is also really nice.
Hope it will be compatible with the latest version of Firefox.

Thanks a lot Piro!

Thanks for turning this into an extension!!
Small problem, even when "promote the first child as the new parent" is checked, closing a parent tab in the horizontal (default) tab bar still closes all child tabs when tree style tabs are working in background and toogled off (works well when tree style tab is toogle on). Hope you can fix this, coz sometimes it can be quite confusing.

Thank you for your work over the years !!

great extension!!

simply essential

Great plug !

Great program. Glad it works with 57. How do you get rid of the tabs at the top? And just keep the ones on the side?

This is A must have plugin for every one, it's more piratical to put the tabs on the side and use the screen real estate to display more content. And for any one which to work with many tabs to have a clue for which tab came from which page and how the tab's are related.

Thanks you @Piro for this great and essential extension. I did worry from the transition to WebExt that this extension will vanish, and start looking on Vivaldi browser which have similar option but a more limited options compared to this extension.

Looking forward for Mozilla to extend the API to allow more control on the browser.

Thanks again.

Thanks Piro for making it work with 57!
One small thing: the about:preferences icon in dark theme is invisible (shows fine in regular tabs).
Also, it would be *great* if there were an option to select tab on mouse hover.

With the speed of Firefox 57+ and the super tree style tabs experience via this addon, there's no browser that can compare. Thanks Piro!!!

Just upgraded to ff 57, every thing is working great except:
1) ff tab bar not hidden
2) when collapsing a tree it overlaps with the tabs and trees above it. I have to keep all the trees expanded now when using the Metal theme!
---
So for those having the same problem with the metal theme, adding this fixes it:
.tab.collapsed {
margin-top: -24px;
}
.tab {
height: 24px
}

Working in 58, but after I restart, all nesting is gone...

"by Piro (piro_or) (Developer) on September 26, 2017 · permalink
Due to unavoidable reasons, TST 2.0 is strongly depends on new WebExtensions APIs introduced at Fx57, so it can't become compatible to older versions of Firefox. Please keep using TST 0.19.x for a while, until Fx57 is released."

Nope. A few days ago the tree structure stopped working in my Firefox 55, with TST version 0.19.2017090601. Now I just have a vertical column of tabs. The whole point of using TST is to be able to arrange tabs into trees, right? Like others are commenting here, TST is a "must have" extension for me. What's up?

Essential

Supporting for FF57+ is awesome!

BTW, does WebExtension has no API to hide native tab bar?