At the moment, Firefox doesn't respect your preference for MP3 and MP4 files. This is a known issue (bug 861090).

Imustbestupid wrote:

Tried changing the "media.windows" etc in the about:config to false. Did not help at all!

If you set media.windows-media-foundation.play-stand-alone to false in about:config, then you should get a download prompt when clicking a direct link to an MP3 file. Do you have an example of a link that still opens in Firefox?

Imustbestupid wrote:

A button on a website that is labelled "Download" should allow me to open the file in my player of choice.

To force a download prompt, the site owner must send the Content-Disposition: attachment header. Example:

• http://freepd.com/Classical/Allemande.mp3

Thanks for the response. I did set 'media.windows-media-foundation.play-stand-alone' to false. I just rechecked again today and it is still false.

Here are two sites that give an example of the problem:

http://www.thisamericanlife.org/radio-archives/episode/521/bad-baby?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+talpodcast+%28This+American+Life+Podcast%29

and

http://www.econtalk.org/

When I hit download on either it opens a tab and begins playing the file.

It started doing this recently (within the last week). Thanks again for taking the time to respond.

That is an mp3 file send as Content-Type: audio/mpeg

I get a download dialog if I disable the HTML5 media player and possible plugins that can play MP3 files.

Imustbestupid wrote:

I did set 'media.windows-media-foundation.play-stand-alone' to false.

Yes, that preference doesn't work anymore.

Set media.directshow.enabled to false to disable built-in support for MP3 files. This might also affect other things, but I don't know what. Playing MP4 (H.264) files still works with this preference set to false.

Imustbestupid wrote:

Thanks for the response.

Thank you for the links. This issue turned up before, but I was never able to find MP3 links without Content-Disposition: attachment, so I couldn't reproduce the problem.

That worked for me Gingerbread Man! Thanks!

I'll report back if there are any side effects, etc. Weee!