Examine source code of winter wunderland

{
  "theme": {
    "images": {
      "theme_frame": "firefoxheader2.jpg"
    },
    "colors": {
      "frame": "#b9bbbf",
      "tab_background_text": "#7ec0c7"
    }
  },
  "version": "2.0",
  "name": "winter wunderland",
  "manifest_version": 2,
  "description": "Snow on the trees, and ducks on the pond"
}