Examine source code of Colourful clouds

{
  "theme": {
    "images": {
      "theme_frame": "cloads-1.jpg"
    },
    "colors": {
      "frame": "#e6e6e6",
      "tab_background_text": "#f4f7c9"
    }
  },
  "version": "2.0",
  "name": "Colourful clouds",
  "manifest_version": 2,
  "description": "Colorful clouds from the plane"
}