Mozilla Firefox on Windows Vista does not automatically download the necessary missing plug-ins to play embedded Windows Media multimedia files in the web browser.

To play embedded Windows Media audio\video files in Firefox on Windows Vista, download the following three files and place them under the “C:\Program Files\Mozilla Firefox\plugins” folder.

npdsplay.dll
npwmsdrm.dll
npdrmv2.dll

You should now be able to stream and play embedded Windows media files within the Firefox web browser.