Thanks to the Light Switch add-on for Firefox, you can hide any other content on the website you are looking for that is not some sort of multimedia. Once you install and start using this extension, you can quickly "turn off the lights" when watching videos or checking out pictures too.
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Some websites, like Hulu for example, give you the ability to dim everything in the background on a page so that you can focus on the video you are watching. What if you could do that on every website? That is what the add-on for Firefox, Turn Off the Lights, brings to the browser.