nostr:npub1e7xjcrjvf4ntrvz7dgflf7yh90r2qmeeahz3a7358z7m67h6qu3sxlm97p Collections are not a native part of firefox or librewolf. You are talking about an addon/extension.

See here for my comment about the various extensions that add this:

https://qoto.org/@freemo/111127788556731265