How can I save and create Tabgroups as the Home Page?

I want to create several Tabgroups as a "standard". That means, specific Websites are saved on Tabgroups, but when I open a new Website, this new Website should not be saved on these groups automatically. And when I open Firefox, I want to see all these groups and Websites on one view as a Home Page. But I can't configure the "Summary page for Tabgroups" as the Home Page. It's only possible to save one Website as a Home Page. The ambition is to configure Firefox, that whenever I start Firefox, I can see the same saved Websites in groups in their new version.