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last.fm "radio" function does not work.. Firefox popup says: "Firefox doesn't know how to open this address, because the protocol (lastfm) isn't associated with any program." What is wrong??

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Last.fm "Radio" function doesn't work! This is the warning that pops up.. "Firefox doesn't know how to open this address, because the protocol (lastfm) isn't associated with any program." What is wrong??

URL of affected sites

http://last.fm

Last.fm "Radio" function doesn't work! This is the warning that pops up.. "Firefox doesn't know how to open this address, because the protocol (lastfm) isn't associated with any program." What is wrong?? == URL of affected sites == http://last.fm

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I have the same problem when I open any page when I open gmail or my rawr homepage in Firefox! MacBook OSX10.4.11

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Last.fm "Radio" function does not work.. Firefox pop up window says: "Firefox doesn't know how to open this address, because the protocol (lastfm) isn't associated with any program." What is wrong??