Examine source code of Christmas background

{
  "name": "Christmas background ",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Christmas background .jpg"
    },
    "colors": {
      "toolbar": "rgba(195, 217, 174, 0)",
      "toolbar_field": "rgba(195, 217, 174, 0)",
      "toolbar_field_text": "rgba(28, 36, 15, 1)",
      "frame": "rgba(194, 215, 172, 1)",
      "tab_background_text": "rgba(28, 36, 15, 1)",
      "bookmark_text": "rgba(28, 36, 15, 1)"
    }
  }
}