How to play webradio with Firefox

[barry yu]

I have to copy the link of a webradio and then fire up VLC, select
open location from clipboard to play the desire audio clip. If I just
brow the website with Firefox and then click on the play now button,
it won't work at all. When I check the Tools->Add-ons->Plugins,
mplayerplug-in gecko-mediaplayer 0.9.9, VLC Multimedia Plugin are
there and with "Disable" button at right side when highlight the
plugin (so I assume these 2 plugins are activated).
Both VLC and MPlayer are working with video, DVD movies.