Firefox doesn't know how to open this address, because the protocol (rtmp) isn't associated with any program.
I regularly watch Swedish TV via SVT Play. (svt.se). I can no longer use the Full Screen option as it defaults to HD Mode. There is an option to change to a slower speed, but when I try to use this option I get the errorl message 'Firefox doesn't know how to open this address, because the protocol (rtmp) isn't associated with any program.'
Wšykne wótegrona (1)
RTMP is a protocol that is used internally by the Flash player. You shouldn't see such an alert.
Start Firefox in Use Troubleshoot Mode in Firefox to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems