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Why does FF fail to reliably play QT movies (.mov) that Safari has no problem with?

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We produce CDs and DVDs that use QT movies linked to web pages. The movies and web pages are all on the CD/DVD. Clicking on a link to a movie (in FF) sometimes works. By sometimes I mean we can click on the link several times and sometimes the movie plays and sometimes it doesn't.

Using Safari, it always works. Using Chrome it always works.

When it doesn't work, all I get is a blank white window.

We produce CDs and DVDs that use QT movies linked to web pages. The movies and web pages are all on the CD/DVD. Clicking on a link to a movie (in FF) sometimes works. By sometimes I mean we can click on the link several times and sometimes the movie plays and sometimes it doesn't. Using Safari, it always works. Using Chrome it always works. When it doesn't work, all I get is a blank white window.