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.

Great add-on that definitely satisfies the niche after tab groups was removed by default. I like that it helps mitigate the problem of having too many windows open by allowing those tab instances to stay alive but remain hidden.

Feature suggestions.
I enjoy the option "Create a new group when opening a new window!" So, here are some suggestions for window options that may go along with it: "open a new group in a new (or the current) window defaults" to speed up workflow, and "delete (or ask for the name of) a(n unnamed) group when closing a window" to reduce the accumulation of unused groups when opening and closing windows. You could also replace this option with one to "delete groups with zero tabs" or otherwise keep track of groups that have been opened by New Window. Another option could be to "

*update* I use this almost exclusively in one window now and it works really well with Sidebars. Thanks for the excellent work!