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Why can I no longer play videos in firefox.

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last night I could watch videos fine but today when i try instead of the video loading it displays a message in the video window saying either that the video cant be played because the file is corrupt or that the mime type is not supported. This happens with every video i try

last night I could watch videos fine but today when i try instead of the video loading it displays a message in the video window saying either that the video cant be played because the file is corrupt or that the mime type is not supported. This happens with every video i try

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Can you please share an example of a video that worked last night but that no longer works?

Also, please try these videos and let me know what happens with each of them.