RealPlayer includes a Web Download & Recording feature that adds a Browser Record Plugin extension to Firefox. This causes problems with Flash content if Flash Player 11.3 is installed. If you don't use this feature, you can turn it off to avoid problems (see Flash 11.3 doesn't load video in Firefox). If you want to keep using this feature, another option is to uninstall Adobe Flash Player 11.3 and install an earlier Flash version as a temporary solution. See How do I revert to a previous version of Flash Player? on the Adobe forum for detailed instructions and download links. (Adobe's uninstaller removes the Flash Player ActiveX for Internet Explorer as well as the Flash Player Plugin for Firefox and other browsers, so you will need to reinstall both.)

What I got from this is that I could uninstall Flash 11.3, that would make it work right?

Ok I uninstalled Flash 11.3. If I need to install it again then I will just turn off the option.

Yes, you can try uninstall and then install again Flash 11.3 and then you will turn off the option. If the problem continues try to install a previous version of Flash.