MIDI stands for Musical Instrument Digital Interface. MIDI files (.mid, .kar, .rmi) are not supported in modern browsers, but there are still a lot of old websites with embedded MIDI audio. MIDI Player extension allows playing those embedded MIDI files. It finds MIDI file references in the <audio>/<bgsound>/<object>/<embed> tags on web pages, and creates the player widget for each, similar to that for playing other audio formats. Please visit https://github.com/jazz-soft/midi-player to see the source code and share your feedback.