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.

Super helpful! I'm one of those people who has over six or seven tabs open all the time, and this makes managing them *so* much better. Thanks!

The best addon. Saves my time. And helps me stay focused.

If you were a die-hard Tab Groups user, this just might be the only way forward for you with FF Quantum.

I tried many replacements for Tab Groups until this add-on came out. In my opinion, it's the only one that even comes close (unless there is a proper re-write of the original Tab Groups for FF Quantum).

There are some bumps along the way - some of them are Firefox bugs, some of them are add-on issues - but I think the developer has been doing a great job of maintaining this add-on and managing expectations.

It's great to be able to group tabs based on what is currently being focused on, and to avoid seeing the noise that is interesting at another time, when you have another focus.
Right now, I want to relax tonight but will probably check things anyway. Actors, facts, etc. But want to leave the planning of the holiday for later. Or things that are interesting for my job.

Happy that someone continues to take care of the add on on the same track. Thanks a lot!

Simple and very useful

A must-have for power users!

It let me upgrade to Quantum. Without extention like old Tab Groups i would switch to Chrome.

This extension has finally allowed me to upgrade to Firefox Quantum. I had Tab Groups extension installed which was not supported on new Firefox at that time and didn't want to make a move without that or similar extension. Simple Tab Groups are just what I needed. Allows to group tabs, to switch groups, doesn't load all tabs in group but only active one (saves RAM).

To all unsatisfied reviewers:
* Tabs loss is not due to this extension, this is an acknowledged Firefox bug. The extension author has shown it happens even without his extension. It is registered in Firefox bug tracker. The best you can do for now is to check that the extension is tracking your tabs (colored triangle on extension icon), back up tab groups before closing Firefox, and hope that either extension author finds a workaround, or this bug is fixed in Firefox itself.
* Adding moz:extension scheme to url is the way to avoid tabs reloading when switching groups. If you disable Fast Group Switching, you'll disable url mangling, but you'll notice that all tabs are loaded at once. This, again, is a limitation of Web Extensions API in new Firefox, which doesn't allow to hide a tab, only to close it. And when you switch groups, you'll need to reopen them. I've heard that tab hiding has finally been added to Web Extensions API. Let's hope it's true, and wait for new version of Firefox which supports tab hiding.

Sad to see undeserved bad ratings.

Thank you to the guys working on this, rating is for digging deeper in Ticket #70 - random loss of tabs.

So far so good. God I've missed this functionality. Please keep up the good work.