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.'
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RTMP is a protocol that is used internally by the Flash player. You shouldn't see such an alert.
Start Firefox in Diagnose Firefox issues using Troubleshoot Mode 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