Firefox 21 won't open mp3s in Windows Media Player

I have set the program to file type option to both "windows media player" and "ask" and Firefox still opens the mp3 in a generic player in a new tab. MP3s played in the Windows Media Player popup window (after downloading) fine in the last version of Firefox 20.X. I've tried disabling the Microsoft WMP plugin (the only way to stop them from opening in a new tab using Quicktime was to disable the Quicktime plugin).

The MP3 MIME settings in Quicktime have all been unchecked and the Windows extension settings all are set to Windows Media Player as the default player for MP3s.

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