Sick of videos automatically playing in Firefox? Here’s how to stop it.

Do the following to block HTML5 video autoplay in the browser:
  1. Type about:config in the browser's address bar and hit enter.
  2. Confirm that you will be careful if the notification comes up.
  3. Use the search at the top to find the preference media.autoplay.enabled.
  4. Double-click on it.

credit http://www.ghacks.net/2015/06/11/finally-mozilla-adds-working-html5-video-autoplay-blocking-to-firefox/

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