Visiting https://getfiddler.com should not result in a error like
Your connection is not private
Attackers might be trying to steal your information from getfiddler.com (for example, passwords, messages or credit cards). Learn more
This server could not prove that it is getfiddler.com; its security certificate is from www.fiddler2.com. This may be caused by a misconfiguration or an attacker intercepting your connection.