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Why is FireFox not trusting my wildcard root CA when a site is HSTS enabled?

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The other two major browsers, Google Chrome and Internet Explorer both exempt sites covered by a trust locally installed wildcard root CA's from HSTS checks, however Firefox throws a certificate warning.

There are legitimate reasons to install a wildcard root CA onto users devices, such as for performing HTTPS inspection within a corporate or education environment, however FF no longer allows this.

I can understand the developers are trying to protect against MITM attacks, but this has to be an oversight or bug?

The other two major browsers, Google Chrome and Internet Explorer both exempt sites covered by a trust locally installed wildcard root CA's from HSTS checks, however Firefox throws a certificate warning. There are legitimate reasons to install a wildcard root CA onto users devices, such as for performing HTTPS inspection within a corporate or education environment, however FF no longer allows this. I can understand the developers are trying to protect against MITM attacks, but this has to be an oversight or bug?

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what error message/error code are you getting?

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Firefox uses it's own certificate store, not the system one tht chrome and IE use. Have you tried installing the certificate in Firefox's certificate store?

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