I'm using the latest Firefox without Adobe Flash (so HTML5 videos) on YouTube. YouTube videos almost always start kind of black, parts of the image are barely visible.

Why do I have to wait a few seconds for the image to "stabilize" and be able to watch the video?

Is there something I can do to have the picture/video load instantly?

Here is what is happening in two pictures (timeline is wrong, I just clicked back to refresh the picture):

first example second example

  • 1
    Is this something happening only on YouTube or also an other video-platforms? Jul 24, 2015 at 15:25
  • Hi, it is not limited to youtube. Same problem with dailymotion.com
    – kevin
    Jul 27, 2015 at 10:19
  • I would like to have some more information. Could you please update your post with some system-specs: CPU(s)/GPU(s)/RAM/OS. Jul 27, 2015 at 10:43
  • Core i5-3470 / ATI Radeon HD2400XT / 4GB RAM / Win 7 SP1
    – kevin
    Jul 27, 2015 at 12:31
  • Please visit videos.cdn.mozilla.net/uploads/mozillaorg and test the three different video-container-formats. Is your behavior constant among mp4/ogv/webm? Or is this only happening on one type? Jul 27, 2015 at 13:03

1 Answer 1


Disabling Hardware graphics acceleration did the trick !

I lose the smooth scrolling but the videos seem to be working fine so far. I guess my video card isn't that well supported on Firefox.

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