Not perfect, but does the job. The only extension of it's kind I know which allows me to quickly check (even from time to time) whether my connection is not intercepted by e.g. corporate tools. Deserves 5 stars. Thanks.

A good little piece of software. Easy to install, do one thing and doing it well.
About the punycode, look at https://www.xudongz.com/blog/2017/idn-phishing/ and don't forget to tweak "network.IDN_show_punycode" in about:config (set it to true) and do the test again.

The only extension that make possible to detect which web site is hi-jacked by the my company's proxy