Well, you're both slightly off. No, midi does not work in Firefox, last time I checked, Mozilla still doesn't like the security of the current API hence it hasn't been implemented.
And no, the website is not using midi at all. Midi is a protocol for sending notes between devices, but there is neither any notes to be sent nor any connections to other devices, this is all local. My guess would be that Handel is using the various Audio APIs only.
And no, the website is not using midi at all. Midi is a protocol for sending notes between devices, but there is neither any notes to be sent nor any connections to other devices, this is all local. My guess would be that Handel is using the various Audio APIs only.