jsmad allows Firefox 4.0+ to play MP3s without any Flash. Faster loading times. Fewer security holes. No 64-bit headaches on Linux. Fewer memory leaks.
It works out of the box under Firefox 4.0 and above. On Chrome 13.0+, you have to enable manually the Web Audio API in ‘about:flags’, then restart the browser and it should work fine! No Opera support at the moment.