title: mediaelement.js wordpress plugin - volume is muted when mp3 played in Firefox
body: <p>I'm using the mediaelement.js Wordpress Plugin.</p>
  
  <p>Whenever I play an mp3 in Firefox 3.6 or 5 it starts muted, and then I must adjust volume and I can hear the audio.  Strangely, the volume control is all the way at the top, so it should not be muted.</p>
  
  <p>I've tested in IE9 and do not experience this issue.</p>