CORS Plugin is a Firefox add-on designed for web developers, providing essential functionalities to manage cross-origin resource sharing (CORS) effectively. This subscription-based tool offers three main features: an on/off switch for easy activation, an input field to specify Access-Control-Expose-Headers, and a field for adding URL patterns to intercept requests and responses. Users can view a list of added headers and matched URLs, streamlining the development process.

When enabled, the CORS Plugin intercepts all browser requests and responses, allowing for seamless handling of CORS requests to specified URLs. By default, it matches all URLs, but users can customize it to enhance their web development workflow. This tool is particularly beneficial for developers looking to simplify the management of CORS in their projects.