14Super60pa pointed out that now that we have LB release and song pages, so we should allow pasting those URLs into the field when adding to playlists or adding manual listens.

I guess we already support this for MB so we just have to support the different prefix, e.g.
https://listenbrainz.org/release/5894ca7b-79c3-4b45-8b7a-96eb2bb19532
as well as
https://musicbrainz.org/release/5894ca7b-79c3-4b45-8b7a-96eb2bb19532 (already supported)

P.S. Look at ListenBrainz becoming it's very own thing!!