Tab Groups triples the productivity for me. I can't even remember how I managed with it. Was it Mutiple browser windows, what the hell.

The addon has it's heart in the right place, I hope it can become functional replacement at some point. I will certainly keep an eye on this addon and update my review.

To Mozilla: Thanks for killing Tab Groups, not once but twice! I'm begrudgingly sticking with Firefox but Chrome and Edge are the browsers I will be suggesting to co workers and family from now on.