I have installed the blocking website node-ca.crt . But neither Chrome nor Firefox are fooled by it. I tried on both Windows (where the antivirus may play with the certificates) as well as upon Linux. Yup, I have installed the CA twice, once in the operating system, and once in Firefox, then I have rebooted and tested this.
And, yup, if you want to know, it redirects the pings to 100.2.3.4 .
I have also tried with the blocking page disabled.