What do you mean "environments"? Do you mean "containers"? The ones called "personal", "shopping", etc?
I've done a quick search for environments in case there's something I missed, and found nothing, so maybe it's a translation issue?
If you DO mean containers, then yes, it's a wonderful idea and I use them extensively[0], but has nothing to do with Tab Groups. If you boil it down, Tab Groups was just an UI extension, all it gave us was another view of all the opened tabs and, if you ask me, that idea matches perfectly with containers; just make each group a container.
My only issue with containers are that you can't move one tab from one container to another. I understand why and the complexities (and maybe even dangers) of doing so, but strictly from an user perspective it feels... wrong. It feels like an arbitrary limitation. Of course, you can copy the url, open a new tab in the container and paste it there, but then you lose all the history (and might need to log in again).
[0] With Tree Tabs I've made every root tab a different container and every time I open a new tab from that root, I made it from the same container.
It is :-) German Firefoxes translate the containers as "environments" which is somewhat logical, at least. I just can't really manage to integrate them into most of my workflows since they basically void my cookies.
