Problem uploading PDF Files

[eluser]marcello romani[/eluser]
For a reason I still don't understand, FF is now uploading the file as "application/force-download".

POST /~marcello/php/ci_doctrine_upload/index.php/upload/submit HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (X11; U; Linux i686; it; rv:1.9.1.7) Gecko/20100106 Ubuntu/9.10 (karmic) Firefox/3.5.7
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: it-it,it;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Referer: http://localhost/~marcello/php/ci_doctri...php/upload
Cookie: ci_session=a:4:{s:10:"session_id";s:32:"75642ca75abf2e25a099a4c0fa3e3d42";s:10:"ip_address";s:7:"0.0.0.0";s:10:"user_agent";s:50:"Mozilla/5.0+(X11;+U;+Linux+i686;+it;+rv:1.9.1.7)+G";s:13:"last_activity";s:10:"1262956976";}bb9cd2413e4da9fe2d982d81c1dd00b9
Content-Type: multipart/form-data; boundary=---------------------------1040701901235425247461644255
Content-Length: 291318


-----------------------------1040701901235425247461644255
Content-Disposition: form-data; name="filename"; filename="sigmetrics09.pdf"
Content-Type: application/force-download

%PDF-1.2
%....
5 0 obj
<</Length 6 0 R/Filter /FlateDecode>>
stream
x..}[....f.>j.#............k....=.......$.DjE.CI<[email protected].:..SQ]@..D...d}.d]....../.~.>.-....7.(..I....._>.....'*,........V.I..K.?...D...'.v.....>......:....`..8.tP.Z...p.(o.?|{.^......$....Q/._..{..:.x....u....:........;......xR..*..kl.R4./j+u.3.......A..7.....gp..

Therefore, adding "application/force-download" to the list of mime-types associated with "pdf" solves the problem.