I do love this add-on. However, if you are adding this to an already used window with multiple tabs, you should make sure to add ALL current tabs to new groups BEFORE you attempt to switch to a new group. I lost a few hundred tabs and using History, spent two weeks trying to re-find those lost tabs. A good idea for multiple tabs would be an add-on similar to "Copy All Tabs Urls WE" 1.0.4 By Michele Pezza - at least you won't lose your tab's addresses.

Awesome! I was missing Tab Groups.

I missed old Tab Grups :)

Step by step I retrieve "Tab Groups" module's features.
Very useful module, thanks!

Great!

brings back functionality of tab groups

Thank you, you saved me :)

This add-on makes it up for the native tab groups being gone at the latest versions. The only issue I have is that when closing tabs (I got 200+ tabs open and need to close/organize them) at the bottom of the group, it scrolls up again after closing a single tab. I wish it would stay scrolled where is was. Hope you will fix this. Otherwise great add-on.

Wow this is what I was waiting for

UPDATE: AS per Drive4ik's reply, tabs are kept open when moving between groups. Good Job!

I would really enjoy this extension if it didn't close and open tabs when changing groups (the old extension would hide and show tabs, not close and open them). I understand that Firefox did not give much control over tabs until recently but I believe they do now allow control of visibility so there is no need to close and open tabs when moving groups

Works almost as previous "Tab Groups" add-on. I'm waiting for possibility of displaying group name instead of colour

Great replacement for removed built-in tab groups! Simple and easy to setup.

I modify my appreciation and give 5 stars insted of 3 because now this module is perfect for me.
Bravo to the author.

I gave this addon the second chance, and it works great! The only feature I miss is exporting/importing specific groups in the addon.

Better than original Tab Groups, best tab manager, works in all modern firefox versions including latest nightly, very well done job, thanks a lot.