at HTTPS-Only option of Privacy & Security section, after selected "Don't enable HTTPS-only mode", then at address bar input "http://192.168.1.27/cgi-bin/my-cgi", the FireFox immeditely switched the URL to the HTTPS mode such as "https://192.168.1.27/cgi-bin/my-cgi" that caused the failure for connecting to the intended URL. Please help to identify the problem and the steps for solving the problem. Thanks