Examine source code of Resurrection Day

{
  "theme": {
    "images": {
      "theme_frame": "emptytomb2.jpg"
    },
    "colors": {
      "frame": "#000008",
      "tab_background_text": "#fcf9f9"
    }
  },
  "version": "2.0",
  "name": "Resurrection Day",
  "manifest_version": 2,
  "description": "View of three crosses from a cave, symbolizing the empty tomb of Jesus Christ"
}