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I have a strange problem with videos in Firefox:
After a while videos played via a HTML5 video player only show a black screen, when actually being played.
The videos play just fine when I restart Firefox or when I play them in Chrome. Also, the audio of the video plays without problems and I can see the preview image before playing. This happens with YouTube, Vimeo and other players.

Please see here for a demonstration: http://www.screencast.com/t/kkFlEk0nup

Any idea what could be the reason and how to fix it?

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    Sorry to ask, are you saying you don't have any issues playing the same video with Chrome? I would suspect it could be a plugin issue... You'd have to disable all the plugins and try again... Also, make sure your video card is up to date, as is FF – Dave Apr 28 '14 at 13:37
  • @DaveRook: Yeah, as you can see in the video, Chrome plays the video without problems, so it is not a video card issue. Furthermore, as I said, restarting Firefox also solves the problem, so I don't see how this could be a plugin issue. FInally, FF is automatically updated. – Daniel Hilgarth Apr 29 '14 at 6:17
  • Can you describe when it happens? I mean, if restarting FF fixes it, how does it re-occur? If you remain on the one video, and keep refreshing or replying the video, does it eventually die? – Dave Apr 29 '14 at 7:13
  • @DaveRook: I never could figure out the trigger. It just happens after some time. But it might be connected to the memory usage. I basically never exit firefox or shut down my computer. I only restart it when the videos that aren't working annoy me too much or the memory usage is way over the top. Like yesterday with 2GB... – Daniel Hilgarth Apr 29 '14 at 18:10
  • Possible duplicate of YouTube videos black, only audio in Firefox – Kinnectus Jun 28 '19 at 13:19
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This is a common error to me. When I fix it, I ensure Firefox is up to date, all plugins are up to date and make sure that Flash is up to date. YouTube runs on flash (the videos only) so make sure it is all the newest version available.

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    Flash got nothing to do with it. YouTube videos run with HTML 5 player in my account. You can choose which one you want. – Daniel Hilgarth Apr 29 '14 at 6:17
  • @DanielHilgarth, but that doesn't mean there isn't flash code on the page (I don't think). Just because it's not playing with Flash, I wonder if it's still trying to use it in some manner? – Dave Apr 30 '14 at 7:43
  • @DaveRook I don't follow. The HTML5 video player has nothing to do with flash. Even if other flash elements on the page aren't working, they wouldn't affect the HTML5 video player. In fact, when I choose to switch from the HTML5 player to the Flash player on YouTube, the videos work. – Daniel Hilgarth May 1 '14 at 11:39
  • @DanielHilgarth Can you not use the Flash player then? – EdG May 1 '14 at 14:58
  • @DanielHilgarth, I too have HTML5 set up as default and I do not have flash installed at work, but, when I load a video, the video itself initially displays the missing flash plugin message. It then switches to HTML5 and plays (all within 1 - 2 seconds).... I know it's a long shot, but would you consider disabling all plug ins and trying? – Dave May 1 '14 at 16:38

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