Tab "sets"

[Leo]

Tab Groups have some support for auto-saving the current group when a new group is selected, which may provide what you're looking for.

Multiple opened tab groups

Yes, make a toolbar button which runs Go TABGROUPLIST=savecurrent,icons and it will show a list of all tab groups, and save the current group (if any) any time you change to a new group using the list it generates. Note that it won't save the group …