I love it. I'm using it to create different areas for my work env. I have stuff to read, docs to follow, and current worspace etc. This extension is excellent, super stable so far.

Exactly what I was looking for. Allows you to load a group of tabs in the current window and flip between groups without any problems. I only wish there was an visual way to identify which groups are currently loaded without clicking on the menu button.

this is very useful in theory and most of the time, but especially recently my tabs have been jumping groups, which kind of defeats the purpose. additionally, I've noticed that when closing my active tab the extension often switches groups automatically, which is annoying.

I had quite some tab groups, but they were suddenly empty, so better keep your bookmarks organized.

Closing a window removes all of the tabs from the tab group. Restore previous session is already enabled. I'm not sure how to trust this extension, though I want to like it.

I don't know what happened, but from some moment extension started to hide my tabs - I couldn't find an option to disable this behavior, it is very annoying. I want all my tabs displayed in a row, not to open a list every time and search from there.

After some time this behavior is back, with v4.5.1 (FF 79)

The extension is great, but I'm sitting on 4.2.2 because in versions 4.3.* the recovery functionality ("Restore") is broken, as a result of which after recovery I have duplicated groups. I ask you to return the old functionality, i.e. such: "Warning! Restoring from backup will ERASE all existing settings and groups!". This is the classic recovery from backups. Or in the new functionality, please make the checkbox "ERASE all existing settings and groups".

Very easy to use. Simplifies my Life!
Would be nice to have automatic backups as I close Firefox. Until now it´s only possible to have daily backups, which are generated when I´m starting Firefox. I don´t think that this is a smart solution, because these backups are not including the tabs I´m opening in the session.

Afer one of last updates regex for catching tabs stopped working correctly. I have some site inside my corporate network with address https://somesite/. I used "https://somesite/" filter to catch tabs with this site and it worked until some recent update. Now the only expression, that works, is "somesite", witch catches all sites with "somesite" in URL. Escaping "/" also doesn't work. It appears that any expression, that doesn't match examples in help tooltip, doesn't work (Firefox 70.0, addon version 4.2.2).
Update: Regex https?\://somesite/? works only when I open link to "somesite" in new tab inside browser. When I enter adress maually or open link from external app (i.e. Thunderbird), it doesn't work.

I can't explain how I've survived without this extension before.... This is perfect extension that is helping me on daily browsing, and daily tasks keeping everything organized and handy. It also saves a lot of space on the nav bar. This should be the default approach on Firefox, while it comes to browsing experience, but I am glad that this extension does the job perfectly. Well done Drive4ik and contributors, well done!

Unfortunately, some of the groups you create randomly lose all tabs. In the next session, only the empty groups will be there. Thus, the extension is unfortunately almost meaningless, too bad. Apart from this, the idea of the extension is great - if it would work though...

This addon has become a vital part of my firefox usage. I can even say it's one of the reasons I'm using firefox and also recommend firefox to others. I hate having so many tabs open. I prefer logical grouping of the tabs. It's more than a nice to have for me, it's a necessity. Great work.

Auto sorting tabs by keywords is ... I can’t decide if I need it, but it looks interesting.
Installed Firefox Nightly 71 + tab manager Tree Style Tab = while everything is stable.

Below was a complaint about the delay in opening the menu on 'F8' - yes, rarely, but sometimes the menu does not immediately open, or does not open at all.