title: canvas.drawWindow is not a function
body: <p>I am working on adding the contents of an iFrame to the canvas in order to save it as an image. I get the 'canvas.drawWindow is not a function' error in FF.</p>
  
  <p>I understand that this only works with Chrome privileges - How do I enable chrome privileges or how should I avoid the error.</p>
  
  <p>Thanks!</p>