install mplayer plugin for firefox and windows codecs first. then its a easy task.
type, about:config in firefox url bar.
then on window right click, and add a string name : “network.protocol-handler.app.mms” with value “mplayer”
again add a boolean: “network.protocol-handler.external.mms” and value set to “true”
thats it, whenever u click on a mms link , firefox will ask u to launch mplayer, and u can see the streaming media.