Why is the "open with" option always grayed out when I click on a file link?

For example, when accessing an email account with firefox and I click on an .mp3 attachment the "open with" choice is always grayed out. This issue is not exclusive to email attachments rather all file links that I click on any site give me the same result. I am using MAC OS X Mavericks.
How can I restore the "open with" selection?
Thanks for your time,
Chris Woods

You can try rename (or delete) the mimeTypes.rdf file in the Firefox profile folder to reset all file actions.
*http://kb.mozillazine.org/mimeTypes.rdf
*http://kb.mozillazine.org/File_types_and_download_actions#Resetting_download_actions
You can use this button to go to the currently used Firefox profile folder:
*Help > Troubleshooting Information > Profile Director: Show Folder (Linux: Open Director; Mac: Show in Finder)

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