NerdeFocus is a free and open-source Chrome extension developed by wizzyfx. It is a valuable tool for quickly debugging focus problems when testing web pages for accessibility issues. With NerdeFocus, users can easily track the focus history using CSS selectors and overlay a focus indicator on the page.

One of the main features of NerdeFocus is its ability to detect focus resets, which is crucial for ensuring proper keyboard focus in web applications. It also provides a convenient way to test keyboard focus and debug screen reader issues in modern web apps.

To use NerdeFocus, simply open your browser's Developer Tools, navigate to the NerdeFocus tab, and click "Record". The extension will then display the focus history and overlay the focus indicator on the page, making it easy to identify any focus-related issues.

Overall, NerdeFocus is a powerful and user-friendly tool for accessibility testing in Chrome. Its free and open-source nature makes it accessible to all developers and testers who are passionate about creating inclusive web experiences.