Please explain the problem in detail. What happens? What is/are the exact error message(s) ? Interesting. I use Firefox v54 as my default and had no problem. But when I used the current version, I got: Secure Connection Failed An error occurred during a connection to dealers.inservices.tatamotors.com. Cannot communicate securely with peer: no common encryption algorithm(s). Error code: SSL_ERROR_NO_CYPHER_OVERLAP '''SSL_ERROR_NO_CYPHER_OVERLAP''' Your server apparently doesn't offer any cipher suites necessary to establish a secure https connection that are supported in Firefox. You can check what kind of cipher suites Firefox can make use of by visiting; https://www.ssllabs.com/ssltest/viewMyClient.html Firefox will just show the SSL_ERROR_NO_CYPHER_OVERLAP error when encountered any site using the RC4 cipher. Note: The website may only work via HTTP and won't work if you force secure HTTPS. You may have to create an 'Off' exception if you use HTTPS-Only.