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