title: Firefox 12, cannot play a sound file. Specified "type" of "audio/mp3" is not supported
body: <p>Here is the HTML:</p>
  
  <pre><code>&lt;audio controls="controls" tabindex="0"&gt;
      &lt;source type="audio/ogg" src="/Public/audio/ding.ogg"&gt;&lt;/source&gt;
      &lt;source type="audio/mp3" src="/Public/audio/ding.mp3"&gt;&lt;/source&gt;
      Your browser does not support the audio element.
  &lt;/audio&gt;
  </code></pre>
  
  <p>The player displays just fine in the latest version of Chrome (<em>18</em>).</p>
  
  <p>Whereas in Firefox 12, the player flashes on initial page load and just fades out.</p>
  
  <p>Here's are the error messages I see when inspecting via Firebug:</p>
  
  <blockquote>
    <p>HTTP "Content-Type" of "application/octet-stream" is not supported. Load of media >resource <a href="http://localhost:18214/Public/audio/ding.ogg" rel="nofollow">http://localhost:18214/Public/audio/ding.ogg</a> failed.</p>
    
    <p>Specified "type" of "audio/mp3" is not supported. Load of media resource /Public/audio/ding.mp3 failed.</p>
    
    <p>All candidate resources failed to load. Media load paused.</p>
  </blockquote>
  
  <p>How can I play an audio file in Firefox 12?</p>