With which content (MIME) type are those files send? If you get a download dialog then that means that the files aren't send as t4ext/html or text/plain, but with a MIME type that Firefox doesn't handle internally. It is also possible that an extension or security software is removing GET data (?xxx=xxx) from the link. Can you post a link to a specific page if the page doesn't require authentication (log in) to access it?