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can only watch video or listen to audio once on some websites

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This only happens when I use Mozilla Firefox web browser but I can only watch a video or listen to audio on some websites once. Once I've watch the video or listen to the audio from the beginning to the end and I later come back to the page I get a blank screen on the video player or get no audio if it is an audio only feature. This doesn't happen when I use Internet Explorer. What's wrong. Is there a certain setting that I need to adjust like with adobe flash player or something?

This only happens when I use Mozilla Firefox web browser but I can only watch a video or listen to audio on some websites once. Once I've watch the video or listen to the audio from the beginning to the end and I later come back to the page I get a blank screen on the video player or get no audio if it is an audio only feature. This doesn't happen when I use Internet Explorer. What's wrong. Is there a certain setting that I need to adjust like with adobe flash player or something?