Closest tab grouping I've found compared to Edge's "tab islands." Having tabs grouped and hidden but leaving behind a group tab is very helpful. Thank you!

A way to keep tab groups across browsing sessions (after browser restart) is needed.

Colored grouping was mentioned before and would help with visual organization. I'd also take colored/unique tab group favicons to more easily see the difference between my groups.

The ability to keep a tab group expanded when none of the tabs are active would help if/when group coloring exists so that all website titles and favicons can remain visible yet clearly grouped.