Always Active Window Always Visible is a Firefox extension designed to enhance user interaction with web pages by preventing them from tracking the activity state of tabs. This tool is particularly beneficial for users of media websites, allowing audio and video players to function seamlessly even when the tab is not currently active. By injecting a small script into every webpage, it modifies the visibility state properties, ensuring that the page appears to be active at all times, which can lead to a more fluid user experience.

This extension supports various tracking methods and events, making it versatile for different web environments. It accommodates both Firefox and Chromium browsers, ensuring a wide range of usability. However, it's important to note that there is currently no exception list, meaning the script is applied universally across all HTTP and local HTML pages. Users can disable the extension if they wish to revert to standard behavior, and additional control is available for Chromium users through context menu options.