RealBasic Garage has set up a Sherlock 3 channel, but I had a dickens trying to subscribe to it using Mozilla. Then I remembered an earlier hint, and a variation on it does the trick:
- Open Internet Explorer.
- Go to Preferences, then Network, then Protocol Helpers.
- Add Helper for "sherlock" without the quotes.
- Choose Sherlock as the Helper application.
- (Re)start Mozilla.