Hoping someone might be able to help me out with this info, I've tried looking and can't find a solid answer.

When you use the "Save and close group" feature of tab groups, do they

1. Stay forever, no matter if you close Firefox, restart your pc, not used that group in months etc.

2. Allow an unlimited, or at least a high number, of saved and closed tab groups.

I mainly ask because it specifically puts closed and saved tab groups in a section called "recent tab groups" which sounds suspiciously temporary.