I tried like 5 different tab grouping addons and this is the only one that actually does it properly. Albeit not exactly what I was looking for, but it works.

Great for managing your tabs! Love it

amazing that someone remade this feature into addon. love it.

It's preventing me from switching to Chrome

Better than the other panorama add-on because it can autosave :D

The only downsides I can think of is that you can't move multiple tabs to another group at once or search through tabs like the other panorama add-on :/

Please add option for custom CSS for Panorama page