Examine source code of Sun Setting

{
  "theme": {
    "images": {
      "theme_frame": "SunSettingH.jpg"
    },
    "colors": {
      "frame": "#23080d",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Sun  Setting",
  "manifest_version": 2,
  "description": "Beautiful sun set going behind the mountains. Sky, sunrise, sunset, mountains, bright, morning, night, evening,"
}