New Tab grouping feature questions

I just activated the new tab grouping feature (that has been something I've really wanted from FF so that I can start getting away from Chrome) and I've tried it out and have been happy with it so far. I understand this is in beta still I think and I had some questions: # I notice that I'm not able to save and close a tab group, is this expected functionality until tab grouping goes GA? # I notice if I have my tab group minimized and have a tab open (that is NOT a part of the group) and I close that tab that the whole browser window will close. Is that also expected? Really excited for this functionality to continue taking off; I do love a way to organize my many tabs!! Cheers,