I love Tab Groups but sometimes I have them in multiple windows and I have not figured out how to preserve the tab group if a window is closed. It would really help if I had a way to bookmark a Tab Group so I could simply open the tab group. Currently I could work around that by bookmarking all tabs and opening the folder in a new tab group, but that seems a little clunky. It would be much cleaner to just work directly with the tab group as a bookmark itself.
There may be a way to do this now, however, if I were you I would wait until a couple more versions are released because these features are already being implemented by the underlying Chromium engine.
If you ask me it’s not yet ready for prime time though, it seems fairly buggy, hence my suggestion to wait a bit.