Examine source code of dark pastel abstract

{
  "name": "dark pastel abstract",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "firefox.jpg"
    },
    "colors": {
      "frame": "rgba(23, 37, 82, 1)",
      "tab_background_text": "rgba(144, 144, 189, 1)",
      "toolbar": "rgba(8, 15, 46, 0.87)",
      "bookmark_text": "rgba(245, 213, 213, 1)",
      "toolbar_field": "rgba(13, 13, 33, 0.98)",
      "toolbar_field_text": "rgba(188, 235, 233, 1)"
    }
  }
}