Request Headers Modifier is a Chrome extension designed for developers seeking to modify request headers, including CORS, for development purposes. This free add-on allows users to customize headers through a straightforward user interface or via a powerful API. The extension's main features include methods for enabling or disabling header modifications, and for adding, removing, or clearing hostnames and headers. With its promise-based API, users can seamlessly integrate this functionality into their automated workflows, enhancing productivity.

The API provides a comprehensive set of methods, enabling developers to manage request headers effectively. For instance, users can add or remove single or multiple hostnames and headers using simple commands. The ability to clear all hostnames or headers ensures a clean slate for testing, while the promise mechanism allows for efficient error handling. Overall, Request Headers Modifier is a robust tool that streamlines the process of managing request headers in web development.