Examine source code of xmas miku

{
  "name": "xmas miku",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "xmasmiku_fire1.png"
    },
    "colors": {
      "frame": "rgba(29, 64, 133, 1)",
      "tab_background_text": "rgba(212, 183, 68, 0.65)",
      "toolbar": "rgba(186, 43, 60, 0.71)",
      "bookmark_text": "rgba(217, 189, 76, 1)",
      "toolbar_field": "rgba(186, 41, 58, 0)",
      "toolbar_field_text": "rgba(217, 184, 76, 1)"
    }
  }
}