Recently I was watching a Gizmodo journalist's videos about her experiment with blocking outgoing connections to Google, FB, Microsoft and Apple. I wonder if it is possible to modify MacOS's built in firewall to block IP ranges that I specify, like all known FB ranges, coinhive etc.?
I used to configure ipfw but this seems to have gone away. I'm running Mojave.
I do not want to run any closed-source program like Little Snitch to accomplish this. I just want to configure Apple's firewall if possible.