Issues with StartSSL Certificates
You may have issues loading your website in Firefox if you use the StartCom (StartSSL) Certificate Authority (CA) as Mozilla has blacklisted the root certificate in October of 2016.
Please see Mozilla's blog regarding this matter.
Update: As of Chrome 56, Google is no longer trusting StartCom SSLs in Google Chrome. These root CAs may not work in other browsers at this time.
Please see Google's security blog regarding this matter.
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