Perhaps this exists already, and if not, it should...

[Bruno Wolff III]

On Fri, Apr 13, 2012 at 17:19:23 -0400,
   Tom Horsley <horsley1953 at gmail.com> wrote:
>
>Of course this is why Internet Explorer works correctly
>so much more often than Firefox, because 99.997% of all
>web servers are misconfigured and send the wrong mime
>type for half the files :-).

You mean incorrectly. Like when I tried to provide links to html source
using a text/plain mimetype and internet explorer disregarded this and
treated the pages as html instead based on the URL ending in .html.