[Bug 434476]

[Buweduvo]

meanwhile, workaround:
media.ogg.enabled;false
media.opus.enabled;false
media.raw.enabled;false
media.webm.enabled;false
media.windows-media-foundation.enabled;false
media.directshow.enabled;false
media.navigator.enabled;false
media.autoplay.enabled;false
media.windows-media-foundation.play-stand-alone;false
media.windows-media-foundation.use-dxva;false
media.peerconnection.enabled;false
media.wave.enabled;false

most players then fall back to Flash, and since FF currently is no media
player because of this bug, its the best thing one can do ....

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https://bugs.launchpad.net/bugs/434476

Title:
  screensaver starts while playing HTML5 videos

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