Mozilla (and Firefox) has a Developer tool that lets you see live HTTP headers. That may help you, but it may not. Take a look at the source of the page. You are on a non-secured page, POSTing data to a secured page. (I always hate this set-up, but not enough people seem to care about the security threat here.) It's very likely that there is actually JavaScript on the page with an onSubmit() or onClick() action that does the actual form POST.
Hope you are successful.
Ivan Heffner
Sr. Software Engineer, DAS Lead
WhitePages.com, Inc.