title: Javascript audio not working in Firefox (x-unknown/unknown)
body: <p>The following JavaScript running in canvas should play audio fine:</p>
  
  <pre><code>var audio = new Audio('tune.wav');
  audio.play();
  </code></pre>
  
  <p>Most of the time it does work, the wav is 24bit 14100kbps and plays fine on several machines,  but on my laptop (Win7, using Firefox 22.0)  I get the error:</p>
  
  <ul>
  <li>HTTP "Content-Type" of "x-unknown/unknown" is not supported. Load of media resource file:///C:/code/sound/tune.wav failed.</li>
  </ul>
  
  <p>I'm aware that there are other libraries to play sound, but I want to keep this pure JavaScript and since it works fine on other machines it might be a hardware problem.
  But I am able to play other audio files fine, so I'm not sure what's going wrong here. Any ideas?</p>