Examine source code of A Simple Christmas

{
  "theme": {
    "images": {
      "theme_frame": "SimpleHolidayH.jpg"
    },
    "colors": {
      "frame": "#2e369c",
      "tab_background_text": "#2e369c"
    }
  },
  "version": "2.0",
  "name": "A Simple Christmas",
  "manifest_version": 2,
  "description": "scrolls, snowflakes, Feliz Navidad, Christmas, holiday, winter, quiet, serene"
}