Firefox won't load .mov files online but plays them locally: QT problem?

My website has several pages with embedded .mov files, which used to play perfectly well, but now only give a question mark after the progress bar fills up.
For example, one of these pages is http://www.paulozelinsky.com/shivers-animation2a.html
Firefox can open this and similar pages that are stored in my computer (on a mirror of the site) and view the animations normally. But online it doesn't work. Typing the path to the online animation file into Firefox's URL field also produces an empty QuickTime window with a question mark, so it's not a matter of the page code.
Is it possible that QuickTime's plugin isn't compatible with Firefox, at least for .mov files like mine? (Created with After Effects 7, using Sorensen 3 codec). Does Firefox use plugins in the same way for playing a file on a web server as playing it in a local folder? Or could there be something going on with my web host?
I would at least like to know if this failure to load the animation is the same for other Mac Firefox users. I have heard that the animation does load, though slowly, for at least one PC Firefox user.
When I first noticed the change, the problem was occurring in Safari as well as Firefox, but now it is only in Firefox.
I have Firefox 3.6.8, and in HD/Library/Internet Plug-Ins I have QuickTime Plugin.plugin v. 7.6.6. I also see in there something called nsIQTScriptablePlugin.xpt.

Bump, bump. Please can anybody help?

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Firefox won't load .mov files online but plays them locally: QT problem?

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