John99: Yes, Adobe confirms I am using 11.3.300.262 Flash. I disabled all other video extensions/plugins and Flash Player plays my videos everywhere including YouTube. With Flash Player and Real Player software everything still plays except that I can't download any videos. I enabled the RealPlayer downloader (Browser Record Plugin 15.0.4) and immediately I could not view any videos at all, except for a few on YouTube. They downloaded but would not replay in RealPlayer. I got a message that Real needed to download additional software. So I clicked Download but got a message that Real couldn't find the software, which was Detailed as being Content Type: video/webm. I don't know what this content is. So I disabled RealPlayer downloader (Browser Record Plugin) and I can see my videos again, but I can't download them using the RealPlayer DOWNLOAD button because it doesn't appear - it is some function of the Browser Record Plugin. So I'm back to the conflict between FireFox 13 and RealPlayer Browser Record Plugin 15.0.4 where I can't download videos using RealPlayer.