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My school's website is not recognizing my new verisign certificate with the latest version of Firefox. Tech supports suggest I revert to an older version of Firefox. How do I revert to an earlier version of 3.6.11?

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The school's website recognizes the new certificate but does not accept it. School's tech support suggest to revert to an older version of Firefox. How do I do that?

The school's website recognizes the new certificate but does not accept it. School's tech support suggest to revert to an older version of Firefox. How do I do that?

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Try to remove the old certificate. Also check if there are intermediate certificates used and stored.

Firefox > Preferences > Advanced : Encryption: Certificates - View Certificates > Authorities