не работает, просто зависает панель вкладок и висит. нашел решение доп-ние "Tree Style Tab", https://addons.mozilla.org/ru/firefox/addon/tree-style-tab/reviews/?score=1

I switched from Arc browser to Firefox because of this extension

noticeably better UX.

Everything is good except for the performance.

Since the last update, this app is clunky, slow, and frequently crashes (the biggest crashed my whole system) with no way to retrieve my previous loaded webpages.

First I thought this finally works, on Linux. But frequently my Tabs disappear, new windows being opened instead of the old one, suddenly I have several windows open, and when I transfer tabs from one window to the other, after a while the whole panel where I dropped it into, vanishes. What good is the use of a program that causes you to do lot of work grouping and arranging and sorting, when it frequently causes loss of data? Snapshots have not done the trick for me, it just gets more confusing when it just opens more windows. Updating Firefox causes loss of all tabs. Erasing a part of the browser chronic through Firefox (just one page) causes loss of all tabs. Is not sufficiently integrated in Firefox on Linux in my opinion.

I ditched Google and came back to Firefox because of this extension. It works perfectly with groups. Just what I was looking for to organize my online life.

Really cool, I'm using it as my main tab bar, the only thing that it lacks (Or I would like it had) is the ability to change the favicon to some tabs so I can have the same page open two times with different favicons like I can change the tab title

Tuyệt vời

Good extension with giant amount of tweaks! The only thing to developer – I'd like to control background color or even hide top header with "Tabs > X" at all.

Thanks

Finally something better than than Tree Style Tab! Well done!

非常好用的扩展。但我想知道未来的更新可不可以加入这个功能：当鼠标指针不在侧边栏区域时，侧边栏自动收缩，只显示网站的图标；当指针移动到侧边栏区域后，侧边栏变宽，且显示的内容变多。
就像Edge的垂直标签页一样