Examine source code of sky and clouds

{
  "theme": {
    "images": {
      "theme_frame": "blackandblue1.jpg"
    },
    "colors": {
      "frame": "#f5faf9",
      "tab_background_text": "#faf7f7"
    }
  },
  "version": "2.0",
  "name": "sky and clouds",
  "manifest_version": 2,
  "description": "night clouds"
}