Firefox 36 has broken the "Add Exception" button for self signed certs

clicking on the add exception button does nothing now in version 36, I had to roll back to 35.0.1

HI ringnjc,
It will depend on the type of self signed certificate. An example url will help better investigate.
However recently, CA 1028 bit RSA certs were phased out in version 36. In order to make sure that the certificates are compatible:
*[https://www.mozilla.org/en-US/about/governance/policies/security-group/certs/policy/ Mozilla CA Certificate Policy
Version 2.2]
[https://blog.mozilla.org/security/2015/01/28/phase-2-phasing-out-certificates-with-1024-bit-rsa-keys/]

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