JDev.HeaderEditor is a free Chrome add-on designed for users who need to edit HTTP headers efficiently. This tool allows users to define custom key-value pairs that can be injected into HTTP requests or responses. By providing a static list of items, users can easily manage and manipulate the headers sent and received during web interactions.

The add-on features a selective reflection capability, enabling users to choose specific items from their predefined list for more flexible header management. This functionality is particularly useful for developers and testers who require precise control over HTTP communications while working within the Chrome browser environment.