How to Add a Security Issuer in Firefox
If Firefox displays a warning about a missing or outdated security certificate when you attempt to access a secure website, you may need to add the root certificate for the website's security issuer to eliminate the problem. A website that uses encryption to protect your username and password information does so using an electronic security certificate that verifies its identity. Companies called "certificate authorities" operate as security issuers, giving security certificates to websites. If you add the "root certificate" for a certificate authority to Firefox, Firefox automatically trusts any website with a certificate from that issuer.
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Instructions
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Download the security certificate for the issuer that you want to add to Firefox. The certificate should have the file extension .CRT or .SPC.
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Click the "Tools" button or menu option at the top of the Firefox application window, and then click "Options."
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Click "Advanced" at the top of the Options window.
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Click the "Encryption" tab.
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Click the "View Certificates" button. A new window titled "Certificate Manager" appears.
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Click the "Authorities" tab.
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Click the "Import" button.
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Find the certificate that you downloaded using the navigation window, and double-click the file to add it to the list of security issuers.
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