Great replacement for the old Tab Groups extensions! Wondering why is not shown as a replacement in the Tab Organizers collections along with the other ones. See https://addons.mozilla.org/en-GB/firefox/collections/4757633/tab-organizers/

Excellent add-in! I keep finding new ways to use it. Looking forward to see how it develops...

This is one of my most important add-ons, thank you very much for the great work. Browsing wouldn't be the same without it. Much appreciate your time and effort. Greetings from Germany

Transformational add-on when used with Firefox Containers. I am using about 20 groups for various clients and other activities. It makes organizing tabs much more efficient than having just one "strip" if you will. I absolutely recommend this add-on and thank to Drive4ik for making this.

Really love this plugin, love how it auto moves tabs belonging to a container to a group you want.

Maybe I'm missing it but is there any way to auto move tabs not in a container to a certain group?

Шикарное приложение, позволяет структурировать большое количество открытых вкладок, что мегаполезно и удобно.

Finally! I have tried about six different add-ons. The disappointment was especially when Firefox reintroduced Tab Containers, and it was nothing like the old genius that was Tab Groups... But this... _THIS_ is even better than what the old was... Intuitive, slick, multiple extra functions such as Backup or icon customization, integration with Tab Containers and much more... Thank you very much, Mr(s). Drive4ik!

One Update: please allow the location of the the backups folder to be moved. I download to my desktop, and suddenly had a mysterious folder appear and didn't understand why. Still a fantastic program.
I've so badly missed Tab Groups, and this app is nearly a direct replacement. It functions well, is easy to manage. I love it. My one suggestion would be, remember what tab was last used in each group, so that when in "Manage Groups" it returns to that tab, rather than the first open tab in that group.

Thank you!!!!

It does the work properly. It's fast, clean, beautiful. Exactly what I need. Thank you so much.

Great Add-on. Thank you very much.

It's so much more that i was searching for, a lot of thanks!

A nice addon to replace original Tab Groups.
But there are two majors problems :
1. At startup, Simple Tab Groups always reopen 2 or 3 tabs that where closed in previous session
2. It's no more possible to switch groups of tab after a few minutes of usage. There is an error "Invalid tab ID". Only possible way is to restart firefox or reload STG addon.
Note : I have near 300 tabs opened in 11 groups (75 in groups with most tabs), if this help

Update 13.02.2019
It look like version 3.3.7 fixed problems described above.
I have no more closed tabs auto re-opening and since update I don't have Invalid Tab ID error.
Or maybe it's Firefox 65 ? Anyway, 5 stars now !