But it is written using the Web Audio API, support for which is now available in Firefox nightly builds, for example. At the moment the FF builds do not support

But it is written using the Web Audio API, support for which is now available in Firefox nightly builds, for example. At the moment the FF builds do not support the OscillatorNode used by this library, but when they do this should work fine. We're working hard on the spec and its test suite to make it easy for other browser vendors to support the API, so hopefully we'll see support for it in more browsers soon. Disclaimer: I co-chair the W3C Web Audio WG.