header_modifier is a free Chrome extension developed by sektion9. This add-on falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. As the name suggests, header_modifier allows you to modify request headers of HTTP requests.

With this extension, you have the ability to add multiple request headers and manage them in profiles. This means you can create different profiles with different sets of request headers to suit your needs. Whether you want to add custom headers for specific websites or have different profiles for different testing scenarios, header_modifier provides the flexibility to do so.

In addition, you can import profiles from JSON files, making it easy to share and collaborate with others. This feature allows you to quickly set up and share specific request headers configurations with your team or community.

Furthermore, header_modifier allows you to add URL filters to restrict the application of request headers to matching URLs. This ensures that the modified headers are only applied to the desired URLs, giving you granular control over their usage.

Overall, header_modifier is a useful Chrome extension for developers and testers who need to modify and manage HTTP request headers. Its ability to create profiles, import/export configurations, and apply filters adds to its versatility and usefulness.