Nightly builds of Firefox are starting to get support for the Web Audio API, hidden behind a pref 'media.webaudio.enabled', which can be set in 'about:config'.

Nightly builds of Firefox are starting to get support for the Web Audio API, hidden behind a pref 'media.webaudio.enabled', which can be set in 'about:config'. At some point when it's considered more useable someone will blog about it and the state it's in.