If you have RealPlayer Browser Record Plugin extension, disable/remove the RealPlayer Browser Record Plugin extension in the RealPlayer Preferences (RP: Tools > Preferences > Download & Recording) . Restart Firefox and test.
I do not have RealPlayer Browser Record Plugin extension. So, disabling that probably is not an option. Also, in the RealPlayer preferences (download & recording) the Enable box was not ticked, so nothing for me to change there.
I did update Java though.
Still, I am having the same problem.
What else do you suggest?
I do notice I cannot install an updated version of Adobe Flash Player (not sure if this is related) so I'm off to try to uninstall the versions on this computer now and then try to reinstall, etc.