MIME type on user.utorrent.com is incorrect.

[ciaobaby]

http://user.utorrent.com/utorrent-free is sending an incorrect Content-Type response header for text/HTML documents.

response headers from WebBug:

HTTP/1.1 200 OK
Server: nginx/1.2.3
Date: Sat, 12 Oct 2013 11:54:20 GMT
Content-Type: application/octet-stream
Content-Length: 0
Connection: close

So FireFox throws an "Unknown application error" because it uses the server headers, whereas Chrome which over-rides the response headers in favour of the meta ContentType directive renders the document correctly.