Netmon is a tool that displays a list of the headers from the HTTP request and response of the page you're currently viewing. It's an application that monitors the HTTP requests and responses, displays the HTTP headers, and allows you to view them both globally and individually for each tab.

This tool is useful when you encounter some sort of weirdness and want to understand what it is, which makes the request and response available.

You can see the HTTP requests and responses and their headers.