Examine source code of Lunar Clock

{
  "theme": {
    "images": {
      "theme_frame": "s.jpg"
    },
    "colors": {
      "frame": "#d9d9d9",
      "tab_background_text": "#e0c9ca"
    }
  },
  "version": "2.0",
  "name": "Lunar Clock",
  "manifest_version": 2,
  "description": "Lunar tide clock"
}