title: Firefox webRTC screenshare enable flags via code
body: <p>I am trying this test <a href="https://mozilla.github.io/webrtc-landing/gum_test.html" rel="nofollow">https://mozilla.github.io/webrtc-landing/gum_test.html</a> for firefox webRTC screenshare.
  It requires following in about:config</p>
  
  <blockquote>
    <p>media.getusermedia.screensharing.enabled</p>
  </blockquote>
  
  <p>to be true and domain name to be added in </p>
  
  <blockquote>
    <p>media.getusermedia.screensharing.allowed_domains</p>
  </blockquote>
  
  <p>There is one way to do this: change prefs.js file in mozilla user profile. But I don't want to do that. Is there any other way like an extension (chrome provides this) to accomplish this task via code?</p>