Examine source code of CHRISTMASX

{
  "name": "xmas",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "xmas.jpg"
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0.19)",
      "toolbar_field": "rgba(0, 0, 0, 0.46)",
      "toolbar_field_text": "rgba(0, 0, 0, 0.83)",
      "frame": "rgba(255, 255, 255, 0)",
      "tab_background_text": "rgba(255, 255, 255, 0.6)",
      "bookmark_text": "rgba(255, 255, 255, 0.71)"
    }
  }
}