Have you tried to play a Windows Media stream in Firefox and got the message "Firefox needs need WMP 11 Plugin"? Click on that and Firefox tries to install the plugin but fails to find a suitable plugin and suggests a manual install.
You might think that upgrading to Windows Media Player 11 could solve the problem. You upgrade to Windows Media Player 11 but the problem still persists.
Well the problem is due to the absence of Firefox plugin for Windows Media Player 11. Fortunately some good guys have been developing it for free.
You can get it HERE
Run the exe to install it. Voila!! you can now view streaming Windows Media in Firefox.