Error Code SEC_ERROR_UNKNOWN_ISSUER — How to Fix it in Firefox

Troubleshooting a common SSL certificate error

One of the more frustrating aspects of web browsers and the errors they generate is that they all generally use different nomenclature. While Chrome and Opera tend to operate on the same plane, Safari, Firefox and Microsoft Edge all do their own thing. Case in point, let’s consider the error code SEC_ERROR_UNKNOWN_ISSUER in Firefox.

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