WebGL audio in Firefox

I'm not getting any audio in my WebGL build when running in Firefox on Ubuntu 64-bit. Chrome audio works fine.

After reading this:

http://stackoverflow.com/questions/21288726/web-audio-playing-back-in-chrome-but-not-firefox

I was hoping there was a small js function for getting the audiocontext somewhere, but apparently its well hidden inside the 24 mb engine js script, which won't even open in my editor.

Does anyone have any clues what I might do to fix this issue? I have to be able to run this build in Firefox.

TIA