I found the same problems to be present under multiple OSes and versions of both browsers, so it is certainly a site issue. Since both the site and Quicktime are developed by Apple, you might want to ask them why they have apparently failed to create legible content on some pages, while succeeding on others, using their own technologies. Happy

The differences between browsers likely boil down to Quicktime plugin issues, but the fact that some Quicktime content works and other content does not indicates that the Apple site developers created flawed content.