how do I disable amazon mp3 downloader as default?

I tried to download an MP3 file from Amazon and stupidly installed Amazon MP3 Downloader. I can't seem to get rid of it nor can I remove the automatic default for MP3 downloads from the firefox options (applications). Files will not download correctly with Amazon Downloader although they will (via another computer) download fine if Amazon Downloader is not installed. I am not very technically minded so I am just going round in circles. What is a plug-in and how do I remove it (if that is the problem)?

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