Going to http://washingtonpost.com (and having it redirect to https) yeilds a 504 with the response: --- An error occurred while processing your request. Reference #97.7c0d0317.1356663462.746961a --- Headers: Connection keep-alive Content-Length 175 Content-Type text/html Date Fri, 28 Dec 2012 03:03:08 GMT Expires Fri, 28 Dec 2012 03:03:08 GMT MIME-Version 1.0 Server AkamaiGHost Vary Accept-Encoding --- To avoid the problem, I've added a boolean config property: extensions.https_everywhere.washingtonpost.com = false I'm using FF 16.02 on OSX 10.5.8.