Disable Page Visibility API is a Firefox add-on designed to disable the Page Visibility API across all webpages. This feature is particularly useful for users who want to prevent websites from detecting whether their tabs are active or in the background. By disabling this API, users can avoid interruptions such as video playback pauses on platforms like Twitch, which typically utilize this API to manage video processing based on tab visibility.

This add-on is categorized under Security & Privacy, specifically in Anti-Spam & Anti-Spy. While it effectively disables the Page Visibility API, users should be aware that it does not prevent other methods of tab visibility detection, such as onblur/onfocus events. Therefore, while it provides a layer of control over certain webpage behaviors, it may not significantly enhance overall privacy.