Examine source code of Read a book

{
  "theme": {
    "images": {
      "theme_frame": "raindroppersona.png"
    },
    "colors": {
      "frame": "#215210",
      "tab_background_text": "#1e3b01"
    }
  },
  "version": "2.0",
  "name": "Read a book",
  "manifest_version": 2,
  "description": "Yes. Don't waste energy rotting your brain and eyes."
}