F20 and playing from firefox a Microsoft Media Server (MMS) file

[Kevin Wilson]

Hello,
I installed Fedora 20 on x86_64.
I try to access with firefox a radio audio broadcast that was recorded
and is on the site now.
I see this message:
"The following plugin is required: Microsoft Media Server (MMS) protocol source.
Do you want to search for this now ? "

I press yes
and I get:
"Failed to search for plugins"
Could not find plugin in any configured software source "

Any ideas? what should I do to hear it ?

Best regards,
Kevin