Examine source code of abstract sunset

{
  "theme": {
    "images": {
      "theme_frame": "sunsetfractal.jpg"
    },
    "colors": {
      "frame": "#707070",
      "tab_background_text": "#9c9c9c"
    }
  },
  "version": "2.0",
  "name": "abstract sunset",
  "manifest_version": 2,
  "description": "This will add a sense of a sunset to the top of your browser in a great way."
}