title: Record the Firefox tab as a video like screencastify on chrome
body: <p>I would like to record a firefox browser tab through browser extension like <a href="https://chrome.google.com/webstore/detail/screencastify-screen-vide/mmeijimgabbpbgpdklnllpncmdofkcpn?hl=en" rel="nofollow">Screencastify</a> extension does in chrome. About Recording Session of chrome extension , <a href="https://developer.chrome.com/extensions/tabCapture" rel="nofollow">chrome.tabCapture</a> API is used to get the stream of the currently active tab and to record the stream <a href="https://github.com/muaz-khan/WebRTC-Experiment/tree/master/RecordRTC" rel="nofollow">RecordRTC.js</a> of Web-RTC Experiment is used. Like wise, Is there any API in Mozilla Firefox to get the stream of the tab in Firefox browser.</p>
  
  <p>P.S : I am asking about recording the tab of the firefox not recording the screen or window or through cam.</p>