Quicktime plug-in missing in Safari, works fine in Firefox

Lion is working fine on my 2008 iMac - except - I can't play QuickTime movies. It tells me there is a plug-in missing.  This only happens with Safari. When I view the same site in Firefox, the QuickTime files play fine. 
What's going on here?

I found this answer on another thread, which may help - it fixed it for me:
Fixed the problem by going into Safari preferences, Extensions, and turned off the extensions for DivX... a temp fix, but will do for now!

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