Over the last couple of weeks I have come across several web
sites that autoplay video and audio at full blast using HTML 5. I have
disabled the options in firefox by typing about:config in the browser
then setting this three settings to false:
media.webm.enabled
media.ogg.enabled
media.wave.enabled
Hopefully the makers of Firefox will have an activate switch for all
HTML5 audio and video like they do for flash player.