QRCode Scanner is a free Firefox extension designed for users who need to scan and decode QR codes directly from their web browser. The tool operates offline, allowing users to decode QR codes without requiring an internet connection. It features manual adjustments for images, including clipping and enhancing contrast, ensuring accurate results even with less-than-perfect QR codes. Additionally, the extension provides options for inverting colors and supports non-image QR codes, which can be enabled through the options page.

The application is open-source, making it accessible for users who wish to explore its code or contribute to its development. The interface is user-friendly, with an auto-close feature for the result window, streamlining the user experience. Furthermore, it integrates seamlessly with PDF viewers, allowing users to select text and decode QR codes within documents, enhancing its utility for both casual and professional users.