YouTube Full Windowed is a Firefox extension designed to improve the viewing experience on the YouTube website by allowing users to toggle a full windowed mode. This feature enables videos to play without the distraction of browser elements, providing a more immersive experience. Users can easily switch to this mode using the convenient hotkey combination of SHIFT + W, and exit back to the regular view by pressing ESC.

This subscription-based tool falls under the Multimedia category, specifically within Graphic & Design. It is particularly useful for those who prefer watching videos in a more focused environment. While the extension is user-friendly and enhances usability, it also encourages community support through donations, which can help fund future updates and improvements.