You need to regenerate the cert with the SAN field:
Problem with firefox and easy-rsa root certificate not working - #4 by vgaetera
If the issue persists, check this:
Installing root ca - #7 by vgaetera
You need to regenerate the cert with the SAN field:
Problem with firefox and easy-rsa root certificate not working - #4 by vgaetera
If the issue persists, check this:
Installing root ca - #7 by vgaetera