hello, firefox version 21 and above now makes use of the codecs that are included in your OS that enable it to directly play mp3 & mpeg files (also for html5 videos). in order to disable that, enter '''about:config''' into the firefox address bar (confirm the info message in case it shows up) & search for the preference named '''media.windows-media-foundation.enabled'''. double-click it and change its value to '''false'''. another way to download the files without tweaking the preference mentioned above would be to right-click the link that leads to a mp3 file or right-click the player in firefox and choose to download the file like that...