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.

Great work.

Juste génial, ça faisait vraiment longtemps que je cherchais ce genre de plugin. Fonctionne à la perfection. Merci au développeur

this is by far one of the best addons on here! finally I can bring some order into my forest of open tabs...

Extensions already have Load-Next-Group, Load-Prev-Group shortcuts, but no Load-Last_Active-Group shortcuts.

Load-Last_Active-Group shortcut is the most frequently used shortcut. But not now.

It is hoped that developers will see this evaluation.