Examine source code of The Christmas Clock

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#0d1431",
      "tab_background_text": "#e5fffe"
    }
  },
  "version": "2.0",
  "name": "The Christmas Clock",
  "manifest_version": 2
}