This simple but highly useful extension's basic premise is that when a person wants to watch a video embedded in a website, it can "dim" the surrounding page so that the person can see the video better. The extension works with embedded videos from YouTube, Vimeo, Dailymotion, Hulu, Metacafe, YouKu and others.
The Turn Off The Lights also has different modes, including a way for an HTML5-based video to fill the entire web page, and a way to customize the look of the backround when the extension is active. There's even a way to show a glow around the video to give the viewing experience a more dramatic look.
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