make the tab groups persistent

[jason919]

Currently, when I close the last tab of a tab group, the group disappears, and I have to manually create it again. I prefer groups over containers because, most of the time, I don’t need the separation of cookies and profiles that containers offer.

At least, make the created groups available when I create a new tab group so that I can simply choose an existing one.

[Jon]

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[adamc]

This feature should never have been rolled out without persistence -- it is valueless as-is.