The windowed-fullscreen-video plugin for Firefox provides users with a convenient way to maximize their video viewing on websites that utilize HTML5 video directly on the DOM, such as YouTube and Twitch. This subscription-based extension allows users to easily toggle a windowed fullscreen mode by simply clicking the icon in the extension bar while the video is playing. This feature enables a more immersive viewing experience without the distractions of a full browser window.

In addition to its straightforward functionality, the plugin allows users to revert back to the normal view by clicking the icon again or reloading the page. This flexibility makes it a user-friendly option for those who frequently watch videos online. The source code for the plugin is available on GitHub, promoting transparency and potential community contributions.