I liked the functionality of this extension a lot, but it slowed my Firefox to a crawl... like 6-8 seconds for a click to register. I had about 20 other addons, so there may have been conflicts. I decided to uninstall it for now and switched to Tab Center Redux.

I like the concept and the customisability. What does not work well is pinned tabs. When Firefox is closed and reopened the pinned tab is gone.

Great addon, but tabs got scrambled once in a while, which completely messes everything up. It's not happening very often, but when it happens, you need to spend a lot of time to fix it.

Great extension! I love being able to organize my tabs in this way, have been using this for a few years now.

Minor complaint:
The recent update that recently (I think?) introduced keyboard shortcuts that interfere with nominal text editing, e.g. Ctrl + Shift + Left/Right, which I use for highlighting words.
The keyboard shortcut editor is generally buggy, as I can't figure out how to disable a key; trying to set it to something useless, like Ctrl + Shift + / or pressing ESC, doesn't work; I can only sometimes set it to "undefined".

May just jump directly to wherever the config lives and kill the keys.

EDIT: Hup, it's already filed and fixed - awesome!
https://github.com/piroor/treestyletab/issues/1995

I love this Add-On... use it and abuse it...
It does take a bit of practice and learning, but it sure works for me...
Only thing I hate is... I can not get rid of the Tab Bar at the top of the browser...I see no point in having it there....
Is there a way to turn it off?

This is great if you have opened like 10 more tabs.
But I love to auto show/hide if it more than xxx tabs open.
Is this possible?

useful replacement for the old tab groups extension. However, it's slow, and on every second addon update it mangles my tab groups.

EDIT: I take it back, it just fixed itself :)

Great Web Extension and only missing one star from perfect as occassionally it just seems to hang when FF is first opened with10 or more tabs opened. I then have to close the sidebar, restart FF then enable sidebar again.

Very good idea but there are some issues with recognizing "pending" tabs. They should be red according to my settings (and it already worked for a short time) but they just keep the style of regular tabs. With over 300 open tabs, this is unfortunately not funny if you don't know which tabs are to be visited yet. With regular CSS and (userChrome) and FF tabs it works like a charm though.

This is an invaluable extension, seriously! It's one of my biggest practical reasons for using Firefox. However I have noticed that the tab context menu doesn't always show options that should be added by other extensions, which is quite annoying. Oh well. This is a fantastic extension still and I'm grateful it's being updated :D

Great, must-have addon, and first reason to using FF for me.
- Tst toggle hotkey change option is needed. f1 by default, srsly?
- Tab context menu needs custiomization too:
-- missed some important options from tabs (Send to other device, etc);
-- ... but its overloaded with items that I would like to disable

Also some occasional errors: seens descend background tab sometimes opens in wrong tree; multiple tabs closing sometimes breaks on halfway

BUG report: 3.9.21 broken, reverted to 3.9.19 and that fixed it.
When it works, it works. absolutely necessary.

Tab Tree was better. Too bad about ff>55

I really love this extension because it makes organising my tabs so much easier and logical. One issue though is that when I restore tab after a crash, I lose all the trees. I have to manually make the trees again which can be pretty annoying. It would be fantastic if you could fix that