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"Video Format or MIME is not supported" started today for me on Facebook.

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sircurly
sircurly
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Until now I had no problems with videos. Videos stopped working today on Facebook . I get the message "Video Format or MIME is not supported". I can listen to the audio, but the video don't work. Also the edge of the video has a broken line all the way around it.

Windows 10 Firefox 50.1

Until now I had no problems with videos. Videos stopped working today on Facebook . I get the message "Video Format or MIME is not supported". I can listen to the audio, but the video don't work. Also the edge of the video has a broken line all the way around it. Windows 10 Firefox 50.1