YouTube Windowed FullScreen is a Firefox extension designed to optimize video viewing by allowing users to play YouTube videos in a windowed fullscreen mode. This feature is particularly beneficial for dual monitor setups, enabling users to multitask while enjoying videos without losing screen real estate. The latest update introduces a less intrusive notification system for updates and options to hide the scrollbar to maximize the viewing area.

The extension offers both free and premium features, with a one-time payment granting lifetime access to advanced functionalities. Users can enjoy customizable hotkeys, auto-toggle fullscreen, scrolling options, and a picture-in-picture mode. Essential features like a search bar and video title visibility are available for free, making it a versatile tool for enhancing the YouTube experience on Firefox.