Good start, but pretty clunky.

I use multiple browser windows across different screens, and the first thing this extension did when I made a group was bring them all into the same window... that was a crash course in how to use it for sure. Then I tried closing my browser and reopening it, and half of my tabs had moved to a new (previously nonexistent) group... so I had to move them all again.

I really miss the old tab groups that Firefox had, and given all the folks using this I expected a cleaner interface. I'm also crossing my fingers that I won't have to spend time every day reorganizing the groups... we'll see. Here's hoping! It's better than nothing, for sure!