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How do I restore video ?

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All video comes up then immediately goes to a green screen. Audio works but not video. ?? Using Windows 7 This occurs on all online videos.

All video comes up then immediately goes to a green screen. Audio works but not video. ?? Using Windows 7 This occurs on all online videos.

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Hi   !
Would you see if there are updates for your graphics drivers:
      http://mzl.la/1xKsEca
Also see:
https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues
And   (shot in the dark):
'Fix video and audio playback problems on Firefox for Windows':
        http://mzl.la/1zLUDHu