Examine source code of Grayscale Clouds

{
  "theme": {
    "images": {
      "theme_frame": "cloudsHeader.jpg"
    },
    "colors": {
      "frame": "#706c6c",
      "tab_background_text": "#bac"
    }
  },
  "version": "2.0",
  "name": "Grayscale Clouds",
  "manifest_version": 2,
  "description": "Grayscale clouds and vector sun rays"
}