title: how to make getUserMedia() work on all browsers
body: <p>I learn about <strong>web-rtc</strong>, it says that you can capture video-cam ,
  i used <a href="http://www.html5rocks.com/en/tutorials/getusermedia/intro/#toc-basic-demo" rel="noreferrer">demo</a> , well this worked on chrome only..</p>
  
  <p>when i open it on firefox i get message <code>"getUserMedia() not supported in your browser."</code>
  on another hand when  i open this <a href="http://www.simpl.info/getusermedia/" rel="noreferrer">HTML5-rocks-demo</a></p>
  
  <p>it worked 100%.
  what changes or plugins or something i miss that let <code>getusermedia()</code> works.</p>