MSW DevTools Controller is a Chrome extension designed to streamline the management of MSW (Mock Service Worker) handlers directly from the Chrome DevTools. This tool enhances frontend development and testing by allowing developers to control handlers in real-time without the need to refresh the browser. It integrates seamlessly with the msw-controller library, providing users with a dedicated panel that simplifies the development process.

Key features include a custom 'MSW Controls' tab that organizes handlers by API in a grouped UI, complete with collapsible sections for easy navigation. Developers can toggle individual handlers on and off using intuitive switches, and any changes made in handler files are automatically synchronized with the panel, ensuring that updates are reflected instantly. This tool significantly boosts productivity by offering a user-friendly interface for managing MSW handlers.