Examine source code of Frost Dark

{
  "name": "Frost Dark",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "icecold-header 2.png"
    },
    "colors": {
      "frame": "rgba(77, 77, 77, 1)",
      "tab_background_text": "rgba(189, 195, 199, 1)",
      "toolbar": "rgba(49, 54, 59, 1)",
      "bookmark_text": "rgba(61, 174, 233, 1)",
      "toolbar_field": "rgba(49, 54, 59, 1)",
      "toolbar_field_text": "rgba(239, 240, 241, 1)"
    }
  }
}