How to add ssl to untrusted SSL cerificate for Vivaldi Linux?

[devila4alice]

Does it have a way to add SSL cerificate to make it block me to open website or something when this ssl appear like untrusted ssl in windows?

[Gwen-Dragon]

Yes. But only for the local user. With a tool called certutil.

f.ex.
certutil -d sql:$HOME/.pki/nssdb -A -t TC -n "YOUR.DOMAIN.TLD" -i your-cert.crt

After import you can list these added certificates:
certutil -d sql:$HOME/.pki/nssdb -L

http://blog.avirtualhome.com/adding-ssl-certificates-to-google-chrome-linux-ubuntu
https://access.redhat.com/documentation/en-US/Red_Hat_Directory_Server/8.1/html/Administration_Guide/Managing_SSL-Using_certutil.html
https://www.centos.org/docs/5/html/CDS/ag/8.0/Managing_SSL-Using_certutil.html