The following preferences are used by SSL Error reporting:

Should the SSL Error Reporting UI be shown on pin violations? Default value: true
Where should SSL error reports be sent? Default value:
Should error reports be sent without user interaction. Default value: false. Note: this pref is overridden by the value of security.ssl.errorReporting.enabled This is only set when specifically requested by the user. The user can set this value (or unset it) by checking the “Automatically report errors in the future” checkbox when about:neterror is displayed for SSL Errors.