Adding a video clip of how it works could have helped guide us on how this really works. For sure, you did well by explaining how this extension worked.

I personal have that kind of spirit that easily got distracted when watching video and at same time surfing the web. This is surely going to help me got that issue solved. I really love the way this extension is been programmed as it makes sure that the entire screen is been faded into black background thereby focusing your attention mainly on the running video.

This is such a great hunt @monajam