I've looked at the other threads and they didn't help.

Mp3s worked in Firefox before I reinstalled Windows. I've since reinstalled Quicktime, checked my Quicktime settings, uninstalled Quicktime, and installed Quicktime Alternative, and checked my Quicktime Settings again. Now, instead of getting the pop-up error window talking about MIME settings, I don't get anything. Nothing comes up, and 'Done' is on my taskbar.

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