Turn Off the Lights browser extension detect all video players also on social networks such as Facebook, Twitter and Google+. When you click on the gray lamp button in your favorite web browser, the extension will search for all the videos on that page. This included the Facebook videos on the page. And highlight it automatically if there is a video available.
The engine to the detect this videos is done with the intelligent video engine. Where it search for the URL of the video player and movie object in the web page. When the comparison value is true, it add the code to push this video player on top of the black layer.