I experienced the situation similar to yours,
I would tell how-to solve it if I could found. Looks like no solution yet.
QuickTime Plug-in 22.214.171.124.73 (they looks normally in about:plugins...)
Cruz, Jaime ??:
Ever since upgrading to the latest version of Apple's Quicktime, I can
no longer view Quicktime videos in Seamonkey (1.1.18). I get messages
that either it isn't installed, or that it isn't installed correctly. I
even removed it entirely and reinstalled from scratch and get the same
I realize this is most likely an Apple problem and NOT Seamonkey, but
I'm wondering if anyone else has seen this behavior?
support-seamonkey mailing list