Examine source code of Afternoon sky

{
  "theme": {
    "images": {
      "theme_frame": "afternoon-sky-top.jpg"
    },
    "colors": {
      "frame": "#9cc0ff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Afternoon sky",
  "manifest_version": 2,
  "description": "A view of the afternoon sky on a hot day."
}