Reply To: Firefox Media

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I think I found something here.

Starting in Firefox 21 on Windows 7 and above, downloaded MP3 files (also MP4 files with the H.264 video codec and either AAC audio or MP3 audio codec) are also automatically played. Firefox Options -> Applications settings for those MIME types are ignored, unless you go to about:config and toggle the preference to false

So try entering about:config in your URL/address bar, enter the key for the Filter, then, assuming that key shows up, change its status to false.