Simple IP Camera Viewer is a subscription-based add-on for Firefox designed for easy access to IP camera streams. Users can open the viewer by clicking an icon in the toolbar, entering the camera's snapshot URL or MJPEG stream, and pressing submit. The application features a fullscreen view, a snapshot button for immediate downloads, and a minimalist interface with no ads or third-party tracking. It operates offline, requiring only a connection to the same network as the camera, enhancing privacy and usability.

The add-on remembers the last URL used, streamlining the process for returning users. It includes essential permissions such as storage for autofilling URLs and webRequest capabilities to handle image headers, ensuring smooth operation without CORS issues. This makes it an effective tool for users needing reliable access to their camera feeds without unnecessary complications.