How to utilize media.windows-media-foundation.enabled?

I have read all the articles I can find on media.foundation. But, I do not know what firefox is looking to on the host os for the appropriate codex.
I am running windows xp pro sp3 and firefox 22. I interpret various forum questions that firefox should play an mp3 file if the os has the appropriate codex. Under windows device manager I have a registered system codex for mp3. Firefox will not play the file but rather offers to d/l it. Is Firefox looking to windows media player for this information?
I would like to know how firefox is using the media.foundation preference in order to adjust my system to it. Any help would be appreciated.

i'm not very good at the technical level but from past crash reports i know that the mfplat.dll library is called which handles the media foundation stuff...
http://msdn.microsoft.com/en-us/library/windows/desktop/bb970511%28v=vs.85%29.aspx
<br>http://msdn.microsoft.com/en-us/library/windows/desktop/ee663600%28v=vs.85%29.aspx

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hello tobyexx79, please set media.windows-media-foundation.enabled back to its default preference and turn '''media.play-stand-alone''' to '''false '''instead.

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Hi,
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How to utilize media.windows-media-foundation.enabled?

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