So far this has been the BEST Firefox tab grouping add-on I've found. I must say that I was really looking for a chrome-like tab grouping addon functionality. Grouping tabs by color and quickly group and ungroup them was the only I was looking for, but for some reason it's hard to find.

For me, FF is a way better browser than Chrome and its chromium-based alternatives, but I must say when it comes to tab grouping, FF is ages in the dark.

Tab trees with their own panels, addons capable of coloring tabs which will not actually get colored, but rather the subtabs within another Tab Trees addon, more different panels with stylish presentation of tabs as if I was using Canva or PowerPoint (I'm clealy referring to Panorama) were among the issues I was facing on my journey to find a simple and clean tab grouping addon.

Fortunately I've found this one that doesn't actually does what I want (which was grouping them in the tab panel at the tome by color), but also does it amazingly by packing them on the backend, and you can quickly switch between your tab groups by clicking on the navigation menu, or setting up your own shortcuts.

It also gives you the possibility to customize the group names, colors and even icons if you want.

I must really thank you guys for this addin which I came to understand that it's even better than the way it's done on Chrome.

This feature is really important to me and I was almost quitting using Firefox due to the lack of decent alternatives.

This addon is even better.
I highly recommend giving this one a try!