My MacBook running Mountain Lion does not allow me to view any videos on the Internet. The place where the video is supposed to be just shows black rectangle. Is there anything I can do to make videos on line work?

My MacBook running Mountain Lion does not allow me to view any videos on the Internet. The place where the video is supposed to be just shows black rectangle. Is there anything I can do to make videos on line work? I discovered that Java quits immediately. Could that be the cause? If so, how do I fix it?

My MacBook running Mountain Lion does not allow me to view any videos on the Internet. The place where the video is supposed to be just shows black rectangle. Is there anything I can do to make videos on line work? I discovered that Java quits immediately. Could that be the cause? If so, how do I fix it?

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