I would try manually copying the folder prior to shutting down firefox and seeing if that works for you. I'm having trouble with a different video platform myself. I've been working with http://www.vitomy.com. I haven't tried everything yet to fix my problem but if I can't work it out I'll be posting some questions here.
Hey guys, I believe you are looking for the Adobe support forums which can be found here: http://forums.adobe.com/index.jspa
This community is a support community for Jive Software, the technology that Adobe uses for its support community.
Good luck guys!