Works as expected on FF57 Rated 5 out of 5 stars

Works great.

The one thing that bothered me enough (apart from hiding the top tabbar with the userChrome changes mentioned in another review) is the fact that the tabs are padded too much for my taste.

Luckily there's a "Extra style rules for sidebar" textarea in the options page, where you can put extra CSS rules for the sidebar. I've added the following in that textarea:
/* slimmer tabs in sidebar */
.tab {
padding: 1px;
}

This review is for a previous version of the add-on (2.0). 

対応速い! Rated 5 out of 5 stars

嬉しい!

This review is for a previous version of the add-on (2.0). 

Works as expected on 57, but you have to do a quick hack to remove default tabs for now Rated 5 out of 5 stars

Until mozilla gets around to creating the API to hide the tab bar, do this:

Go into about:config and set browser.tabs.drawInTitlebar to false

Go into about:profiles, click Open Folder on root directory, create or open the "chrome" folder and create or edit a "userChrome.css" file in that folder (capitalization counts, even on Windows). Enter the below in the userChrome.css file, save it, close and restart Firefox:

/* Hide tab bar */
#TabsToolbar { visibility: collapse; }
#sidebar-header { display: none; }

This review is for a previous version of the add-on (2.0). 

Can't live without addon Rated 5 out of 5 stars

absolutely elated that TST will be 57+ this is the only add-on I cannot live without and why I use Firefox exclusively. Thank YOU! Piro

This review is for a previous version of the add-on (2.0).  This user has a previous review of this add-on.

Thanks for porting it to FF57, but still it's not the same Rated 4 out of 5 stars

It makes FF57 usable at least(but still missing much functionality). Is there any chance we'll be able to remove default tab bar after installing this addon? Is there webexternsion api to do this? Another thing is that I cannot find a way to move tabs to right instead of left side of the window...

This review is for a previous version of the add-on (2.0). 

There is a discussion about a WebExtensions API to hide the tab bar: https://bugzilla.mozilla.org/show_bug.cgi?id=1332447

You can move the sidebar from left to right by Firefox's built-in option. See the sidebar header and click the label "Tree Style Tab", then you'll see a list of switchable sidebar panels and the "Move Sidebar to Right" option.

Firefox 57+への対応に感謝します Rated 5 out of 5 stars

以前のバージョンと比べると再起動したときに勝手にツリーが崩れていたりするバグが無くなっていたり、見易さが向上していたりでかなり使いやすくなった様に思います。
しかし、上部にあるFirefoxデフォルトの横型タブは以前のTreeStyleTabの様に消す(見えなくさせる)事は出来ないのでしょうか?
オプションを見てもそういう風な設定は無さそうです。Firefox側で制限されていたりするというのならば仕方ありませんが...

もう一つ、オプションでテーマを設定してもTreeStyleTab最上部のサイドバーを閉じるボタンがある部分の色が変わらないのは仕様でしょうか?Firefox側のテーマもTreeStyleTabのテーマと合わせて暗色系にしたのですが、そこだけ白くなっており、他の部分と比べ少し浮いているのが気になります。

edit: なるほど...わざわざbugzillaへのリンクも貼っていただき感謝します、そういうことなら仕方ないですね。Firefox側の対応に期待して首を長くして待つことにします。

This review is for a previous version of the add-on (2.0).  This user has a previous review of this add-on.

残念ながらどちらもアドオン側からは解決できない問題です。Firefox側での改善に期待するしかないのでした。具体的には以下のbugが該当します。

1332447 - WebExtension API to hide the tabstrip
https://bugzilla.mozilla.org/show_bug.cgi?id=1332447

1385518 - [Photon] Update sidebar styling for dark theme
https://bugzilla.mozilla.org/show_bug.cgi?id=1385518

yaaaaa Rated 5 out of 5 stars

it works on 57!

This review is for a previous version of the add-on (2.0). 

Rated 5 out of 5 stars

Great!

This review is for a previous version of the add-on (2.0). 

Great news for v57+ users! Rated 5 out of 5 stars

Been using TST for many years and was afraid I'd lose my favorite extension after Quantum v57 upgrade. Thank you Piro!

This review is for a previous version of the add-on (2.0).  This user has a previous review of this add-on.

THANK YOU FOR MAKING FIREFOX GREAT AGAIN! Rated 5 out of 5 stars

You sir, are a hero.

And those who want FF to look like it did with the previous version of Tree Style Tabs, see the hints here: https://news.ycombinator.com/item?id=15342728

This review is for a previous version of the add-on (2.0). 

Welcome back! Rated 5 out of 5 stars

I am really glad this extension now supports FF 57+. Now I can return using Firefox.

This review is for a previous version of the add-on (2.0). 

55 Rated 5 out of 5 stars

Can you add compatibility with 55?

This review is for a previous version of the add-on (2.0). 

TST 2.0 = for Fx57 and later, TST 0.19.x = for Fx 56 and older

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.

This addon is the single reason I came back to Firefox Rated 5 out of 5 stars

Working with a lot of tabs is a huge pain - but now I am able to organize them and not loose track. Please keep the updates coming.

This review is for a previous version of the add-on (2.0). 

This add-on keeps me using Firefox Rated 5 out of 5 stars

The most productive add-on ever built!

This review is for a previous version of the add-on (0.19.2017090601). 

Brought me back to Firefox Rated 5 out of 5 stars

After slowly sliding to Chrome, I am back and the reason is this add-on! Absolutely love it, because I can see all my tabs at a glance and related tabs are grouped together.

This review is for a previous version of the add-on (0.19.2017090601). 

TST is the only reason why I use Firefox Rated 5 out of 5 stars

Helps me group tabs by topic and understand the chronology of opening tabs.
It perfectly fits to my way of browsing - open everything I see relevant and review each tab by tab.
This plugin is the only reason why I continue to use FF, everything else is far behind the TST.

This review is for a previous version of the add-on (0.19.2017090601). 

Rated 5 out of 5 stars

this is the only way i can use the browser

This review is for a previous version of the add-on (0.19.2017090601). 

Always the first addon I install Rated 5 out of 5 stars

Can't live without Tree Style Tab! Please please please please please keep it working when everything changes!

(Request: a keyboard shortcut to toggle expand/collapse current tree. Definitely not worth losing a star for, though.)

This review is for a previous version of the add-on (0.19.2017090601). 

can't collect the tree again. Rated 5 out of 5 stars

after expand the tree and close the firefox 64 55.03,the tree should belong to the father tree ,but in fact the sub tabs all become the father tab and isolated,it also happened in windows 10 and Mac OS Sierra.

This review is for a previous version of the add-on (0.19.2017090601).  This user has 2 previous reviews of this add-on.

Great extension, but not looking right in FF55 Rated 4 out of 5 stars

Great extension! One of my go-to add-ons for new installs.

Had to do a refresh for FF 55 and when it reloaded the "Mixed" Skin is showing the same as the "Flat" skin. Also needs to be updated for the 57+ FF update rules.

This review is for a previous version of the add-on (0.19.2017090601).