about:preferences#privacy, then go to "View Certificates" –> Authorities.
In Google chrome, use following sequence of links after downloading the certificate.
Seetings --> Show advanced settings... --> Manage certificates... --> Trusted Root Certificate Authorities --> import.
Import a CA certificate in Centos7.
# cp ROOTCA-iitk.ac.in-cacert.pem /etc/pki/ca-trust/source/anchors/ # update-ca-trust extract