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I cant wath videor on sertain sides, wich settings should i change?

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I cant watch videos on certain web pages. I get the audio but the video stays black.

I cant watch videos on certain web pages. I get the audio but the video stays black.

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There are some compatibility issues between the latest Flash player and some Firefox add-ons or settings. Could you see whether anything in this article helps: Flash 11.3 doesn't load video in Firefox.

You might also consider disabling the new protected mode in Flash 11.3, since that feature is currently being debugged. See this support article from Adobe under the heading "Last Resort": Adobe Forums: How do I troubleshoot Flash Player's protected mode for Firefox?