One Update: please allow the location of the the backups folder to be moved. I download to my desktop, and suddenly had a mysterious folder appear and didn't understand why. Still a fantastic program.
I've so badly missed Tab Groups, and this app is nearly a direct replacement. It functions well, is easy to manage. I love it. My one suggestion would be, remember what tab was last used in each group, so that when in "Manage Groups" it returns to that tab, rather than the first open tab in that group.