Quicktime movies playing sound with no picture (only in firefox)

Hi There,
I'm having a weird issue with quicktime in firefox on apple macs. I'm not really familiar with macs and I was wondering if someone can offer a solution? When I visit the page in firefox on a mac the video plays sound but not the picture. This seems to happen to all firefox browsers that I have tested.
I have a test link here for people to look at. http://www.wellcom.net.au/quicktime.aspx

To Apple Discussions!
Thank you for providing the link for others to test for you. A got a flash video which I had no problem viewing with sound. The picture did take a few seconds to appear. However, the sound came in right away. Here is the direct video link: http://www.wellcom.net.au/images/movingimages/BookCity.mp4
Picture & sound was instant from the .mp4 link.
Make sure you have the latest versions of Adobe Flash Player Software, repair permissions & restart your computer.
If the above does not work, then please advise which version of FireFox you are using?

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