This site can’t provide a secure connection

Developing on localhost without https? It may happen, but Chromium-based browsers and Firefox will force you periodically to use https connection. And then you reload the page and see:

This site can’t provide a secure connection

At this point you won’t be able to use your localhost. However, here is the solution that will help.

1. Open chrome://net-internals/#hsts
2. Go to Delete domain security policies
3. Type your domain, e.g. example.com and activate Delete