Youtube videos freeze, audio keeps playing. As long as I keep moving my cursor, it play ok. What's wrong?

This seems to happen on all Youtube video's I play. I don't know about other videos because I seldom view any others. When the video freeze happens the download bar is always ahead of the play bar so I don't think download is the problem. However, when the freeze happens, the download bar stops moving. When the play bar catches up to the download bar, the audio stops also. If I move my cursor, the video and audio start playing again. As long as I keep my cursor moving, the video plays fine. I am using Firefox 18.0.1. Computer is an HP dv6-1350us with dual processors. OS is Windows 7. I also use Chrome at times and the freeze doesn't happen on Chrome.

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