Exonerator should set a Content-Type
https://exonerator.torproject.org/ does not set a Content-Type
(either in a header or in an equivalent meta tag), but it does set X-Content-Type-Options: nosniff
. This prevents Chrome/Chromium and IE from sniffing the Content-Type, so the browser just renders the HTML source code as text. Firefox does not interpret this particular X-header, so it sniffs the Content Type type and renders the page as HTML, which seems to be the intended behavior.
Trac:
Username: garrettr