Mh, that’s unfortunate. Do closed-source apps use less RAM? Like MS Office compared to Libre Office? Not sure if it would be fair to compare Safari to Librewolf since it’s probably optimized for MacOS. I think generally programs become less RAM efficient since people tend to have more nowadays.
Recently found out about
https://listenbrainz.org/
But when I log in via my Musicbrainz account it just loads indefinitely. Seems to be a bug with some server cache on their side at least someone said so in the forum. Maybe it works with another account.