Local SSL certs in Firefox on Arch

Steps to get up and running local dev SSL certificates with Arch Linux.

Combine:

• https://dev.to/lmillucci/firefox-installing-self-signed-certificate-on-ubuntu-4f11
• https://stackoverflow.com/questions/13732826/convert-pem-to-crt-and-key

Use the cert file from an mix phx.gen.cert, convert it:

openssl x509 -outform der -in your-cert.pem -out your-cert.crt