Very useful. Thanks!

Simple Tab Groups is "exactly" what I was looking for to replace the old Tab Group Manager! I delayed upgrading from the old version of Firefox for a long time because I didn't want to lose the ability to group tabs. I tried several other tab managers first, but they didn't do what I wanted. STG is very intuitive, very functional, and easy to learn. I can't say enough good things about it! The only thing it lacks, compared to the old Tab Group Manager, is the ability to resize groups in the "Manage Groups" display, but this is a minor issue, and in some ways the ability to scroll down for additional groups is an improvement over Tab Group Manager, which couldn't scroll and would get very crowded with a lot of tabs and groups.

Indispensible for me at work & home.
STG and its predecessor are the reason I use FF

amazing!! wonderfull stuff, thx.

Great addon usefull and I can't work without it. Just a new bug in 4.0.1.2 = the welcome page is fixed now OK but now it's goes always on the first tab on the group instead of going to the last opened tab ... thanks bye

Endlich eine vernünftige Gruppierung meiner Tabs möglich. Und: Es funktioniert auch alles einwandfrei!
Sehr sehr angenehm. 100 Punkte.

Exactly the functionality I wanted to have back from the good old days!

Reverted back to Version 3.4.4
It seems version 4.0.0.2 Does not save groups when the firefox option 'Clear history when firefox closes' is enabled.

One of the best add-ons you can get for Firefox! Many customization options, easy to use, fast, reliable, nice UI, good support ... I could go on.

I use it everyday at work to organize my tabs. I am editing pages in Confluence in one window, and open tabs with background information (that I stored in a dedicated tab group) in a separate window in just one mouse-click! I also have tab groups for my different projects.

Highly recommended and many thanks to the developer!

Like others, after today's update I'm getting "No support incognito mode, please disable incognito mode for addon" message and plugin is not working anymore. Been working great, but now I'm stucked in one tab group and hoping that other groups aren't gone. Fix this, pretty please. It was "a-must-have-plugin" until now... :(

UPDATE: after developer's response I was able to make it work again! Thanks! It was pretty easy and I don't understand why I was not able to do it by myself before :D

Most useful Tab Manager ever, Keep it alive please!

If you are switching from Chrome and looking for an alternative to TOBY, this is the one.
I think this should be the first extension that anyone should install as soon as they switch to Firefox.