I routinely have trouble getting Firefox to open MP3 files in an application on my Windows 7 laptop. When I visit an MP3 URL (sample link from A Prairie Home Companion), I get the following dialog box:

Open file dialog screenshot

I have Windows Media Player set as the default MP3 file handler in Windows, and I also have the Do this automatically for files like this from now on option selected. Regardless, this dialog always opens up. I even have the application set in Firefox's Options > Applications area:

Application setting

Is there a way I can force Firefox to open MP3s in the application of my choice, without getting this stupid dialog?


As Firefox chooses configuration of a hosting servers over user preferences Preferences -> Applications -> Content Type Actions (about:preferences#applications) - a hosting server could force the download of a file (HTTP Content-Disposition header: disposition-type = "attachment") even when you prefer other action.

InlineDisposition Firefox extension could help to avoids this situation by changing the disposition of Content-Disposition response headers from attachment to inline.

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