Firefox 17.0.7esr (Mac OS X) claims QuickTime 7.6.6 plugin being insecure

Hi,
when loading pages with QuickTime movies Firefox 17.0.7esr (Mac OS X 10.6.8) claims QuickTime 7.6.6 plugin being insecure and does not load the movies. The links in the warning (update plugin, click here to load the plugin) don't work either :-((
QT 7.6.6 is the latest available QT for this version of Mac OS X and the Mozilla Plugincheck show that the plugin is up to date.
Any idea how to fix the extremely annoying behaviour?
(btw this report war written from a older FF version which at least still shows the movies...)
Cheers
frank

Is the system claiming "insecure" pages for any movie you look up or just for some?

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