I need some Firefox help with quicktime and divx, flash silverlight working!!

Hey I need some help getting quicktime and divx to work in firefox.  I've managed to get flash working and also silverlight but when I go to a page that requires Quicktime Firefox says that it needs the quicktime system extension 7 or higher. I have no idea on how to install this. Regarding Divx, firefox shows the divx web plugin installed but any pages that require it do not see that it is installed. Is anyone able to help me get these working? The version of Quicktime I'm trying to install is 7.6 and the divx player is the newest 2.1 for osx.

I too am having no luck with anything QuickTime in firefox browsing on my apple tv. I do have flash working though. Anyone???