Q:

Firefox on WinXP delivers odd mime-type for uploaded PDF

When uploading a PDF file from an HTML form, the mime-type Firefox (WinXP) provides in the request header is:
Content-Type: /home/www/vesta/services/stamper/data/e5456e0699badbe373740d28eca79d09:
I've seen plenty of application/pdf and application/download, but never anything like this. 
[BTW, I understand that trusting the file extension and the mime-type reported by the browser is unreliable, since it all comes from the client-side.  Of course, server-side introspection methods are more reliable.  But I'm still interested in this unusual browser behavior.] 
Anybody ever seen something like this?  Many thanks in advance. 

A:

See this Ubuntu bug report and Mozilla bug #373621. 
For some reason, Firefox has been convinced (via mimeTypes.rdf) that PDF files have a different MIME type.  Delete the offending entry from your mimeTypes.rdf file (in your profile directory).