In Firefox, the "media.autoplay.enabled" pref can be used to disable the "autopl...

		mbrubeck on Jan 15, 2014 \| parent \| context \| favorite \| on: Everyone can now track down noisy tabs In Firefox, the "media.autoplay.enabled" pref can be used to disable the "autoplay" attribute for the <video> element. (But I think it may still be possible for pages to auto-start videos using JavaScript.)