Examine source code of Moon over the Gate

{
  "theme": {
    "images": {
      "theme_frame": "GoldenGate.jpg"
    },
    "colors": {
      "frame": "#450138",
      "tab_background_text": "#9caefc"
    }
  },
  "version": "2.0",
  "name": "Moon over the Gate",
  "manifest_version": 2,
  "description": "Moon over the Golden Gate Bridge at night."
}