Latest version is indeed broken, but if you follow the workaround provided by the author it does work. I had to reload the extension after updating permissions.

A new thing I noticed, which may be a new bug introduced is that when I create a new tab from a grouping the new tab doesn't associate properly. It always ends up at the top level at the end.

version 3.9.21 "contains fatal issue on the startup. There is a workaround: grant an optional permission "Read and modify bookmarks" for this addon via the addons manager UI. The next release will become working without the permission."(c)developer

it's a shame to developer to push such version to production and does not provide fix as soon as he noticed it.

UPD: bug has been fixed in a few days, so the rating was fixed too.

Love this extension as it's made it easier to move about from Edge. I would like to see the side bar auto-collapse, showing only the favicon.

This add-on is the reason I still use Firefox. I salute Piro for keeping this extension going despite Firefox challenges. I really miss auto-hide. I've been having a lot of trouble lately with selecting the folder when I bookmark a tab or tree. The folder box has a - in it, and when selected, pops up an empty box which doesn't respond. Has anyone solved this problem?

Please implement

Ability to place a new tab button in the top bar

Find tabs at the top of the panel

And show an interactive animation line at the bottom of the tabs when loading

Display count tabs

с контрастной темой в стиле протон не видны названия вкладок (темно-серого цвета на фоне черного)

Excellent for me. Very customizable. Only slows down the pages even with multiple tabs. Without it the speed is OK.

This is a very good addon, but there is a missing thing which is the following:
I do not want the appearance of the hierarchy between the tabs to be in the left side neither the right side

I want the hierarchy to appear in the top side, I mean in the original tab bar of Firefox, I mean like what was in the old versions, before converting the addon to the type of web extension
I mean
like what Piro have written in his website about this addon that this addon Shows the tab bar as a tree of tabs.

but I do not find this option in the preferences like before

I hope Piro (piro_or) update the addon with this feature

picture in firefox theme will be stretched as this addon's background, looks strange, hope for fix in furter updates.

整理成树状标签的功能确实很好用，但是将其调整为树状视角时，会出现标签页被被重新打开的情况，这会导致历史记录被重复记录。

j'adore le concept en arborescence, car ma pensée intuitive fonctionne de cette manière. par contre ce serait tellement bien de pouvoir choisir des couleurs pour s'y repérer comme dans edge. Je vais pas utiliser un navigateur microsoft pour ça, mais j'en connais certains qui ce sont fourvoyé juste pour leur super fonctionnalité d'organisation des onglet lateraux. en tout cas merci pour cette appli qui est dejà top!

I am extremely pleased with this add-on. I have one bigger complaint that might be worth looking into - it works well on all websites except youtube. When I have the sidebar open, it cuts off part of the youtube website - for example in opened video, I can't view the first letter of the title or profile pictures of commenters.

I would like to make one suggestion for improvement:It doesn't make sense that among the links opened in a newly opened tab, the last opened link is automatically listed at the end. Because the last page you open is definitely the one you want to see most, and this extension automatically takes the last page you open at the end, so it's a step of moving the mouse. The correct way to open a link is to open it near the "parent" tab, which is to the right of the "parent" tab. The first link opened from the "parent" tab should be at the end, which is much better.
我希望能提一个意见改进：在一个新打开的标签中打开的链接中，最后打开的链接会自动排列在末尾，这是不合理的。因为最后打开的页面肯定是自己最想看到的，而这个扩展却自动把最后打开的页面拍在最后面，这样多了一步移动鼠标的动作。正确的链接打开的方式应该是在靠近“父”标签页打开，就是在“父”标签页右边打开。而最先从“父”标签页打开的链接应该拍在最末尾，这种方式打开要好的多。

google検索上で画像を直接開くとツリータブがフリーズしてしまいます。

Ogólnie bardzo dobre rozszerzenie, jednak ma jedną wadę: zajmuje sporo miejsca w ui, poza tym OK