For some reason, noStrudel on firefox isn't detecting nostr-relay-tray so I can't select it for the cashing relay.
It's possible that the browser's privacy protection is blocking noStrudel from detecting if there is a service on port 4869.
That's exactly what it was.
I downloaded the latest Firefox and used the default configuration, and it can detect nostr-relay-tray.https://image.nostr.build/2d76f194e48cf0aa2b1f957c83454eedce7b7bcc4a0cfda5fab74c213691487f.png