Examine source code of Cartoon Horse

{
  "theme": {
    "images": {
      "theme_frame": "firefox_banner_horse.jpg"
    },
    "colors": {
      "frame": "#f5cf7d",
      "tab_background_text": "#1b3307"
    }
  },
  "version": "2.0",
  "name": "Cartoon Horse",
  "manifest_version": 2,
  "description": "Cute cartoon horse in the field. Artist John-Marc Grob again creates a love-able picture."
}