Author here, please let me know any comments, issues or anything else.

I'm also behind other projects like an SSL (site) test, a fast one: https://ssldecoder.org/ and a certificate monitoring service (reminds you before expiring): https://certificatemonitor.org/.

Also my personal site describing my adventures in *NIX and cloudland: https://raymii.org/s/, plus a boatload of TLS related articles.

The mozilla guide is also very good, the ability to configure based on your server settings and browser support is a heck of a nice feature. Whenever I have time to learn javascript that's the first thing to implement.

Although, all my projects are open source (https://github.com/RaymiiOrg/) so merge requests are welcome. Ferm GPL believer here.