Page Dark covers the webpage with a black screen when you click the toolbar button or use the hotkey. Everything except media like videos or games, frames and Flash objects will be hidden by it. This allows you to watch online videos, play Flash games, etc in a much more enjoyable way.
Source of inspiration: Night Vision
's TOtL API, a mechanism created in 2010 to help websites interface with add-ons like TOtL (Mini) and Page Dark.Please rate/review! :)
Feel like donating? You can use the button for Paypal, or help me out with Bitcoin!