Examine source code of Cow Field

{
  "theme": {
    "images": {
      "theme_frame": "cow_banner.jpg"
    },
    "colors": {
      "frame": "#4a290c",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Cow Field",
  "manifest_version": 2,
  "description": "Cows in field in California along highway 46 in summer, browns and golden grasses"
}