The other day I was having some videos that should have come up in Windows Media Player start coming up in QuickTime. I changed some settings, and they ended up working. HOWEVER, now I find that some sites that have embedded video don't show the video - there is a blank space where the video would usually be (and where the video IS when I open the site in Chrome). I'm afraid that I screwed something up and have tried re-setting things back to QuickTime, but nothing I've tried has fixed this. An example of a site where this is happening is here: http://www.entrepreneuressacademy.com/ I'd left that open in a tab "to watch later", but when I got around to it (I hadn't realized that it was just a 30-second clip), the video wasn't there in FireFox. I've tried re-setting options, closing and re-starting FireFox, etc., but this (and other) embedded videos are suddenly just not there (again, in FireFox, they're fine in Chrome, etc.). Also - embedded YouTube videos seem to work just fine ... it's other sorts of embedded videos (which USED to show up in FireFox) are now just blank spaces.