The FNMT-RCM root certificate is not yet included in NSS. That request is Bug #435736.
There are two ways a user can work around this problem...
1) Add an exception as described here: https://support.mozilla.org/en-US/kb/connection-untrusted-error-message#w_bypassing-the-warning
or
2) Manually import and trust the root certificate as described here: https://wiki.mozilla.org/CA:UserCertDB#Importing_a_Root_Certificate
*** This bug has been marked as a duplicate of bug 435736 ***
The FNMT-RCM root certificate is not yet included in NSS. That request is Bug #435736.
There are two ways a user can work around this problem...
1) Add an exception as described here: /support. mozilla. org/en- US/kb/connectio n-untrusted- error-message# w_bypassing- the-warning
https:/
or
2) Manually import and trust the root certificate as described here: /wiki.mozilla. org/CA: UserCertDB# Importing_ a_Root_ Certificate
https:/
*** This bug has been marked as a duplicate of bug 435736 ***