Examine source code of Darker blue variations

{
  "name": "Darker blue variations",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "FFHeaderImage03.png"
    },
    "colors": {
      "frame": "rgba(19, 33, 64, 1)",
      "tab_background_text": "rgba(245, 245, 245, 1)",
      "toolbar": "rgba(39, 55, 92, 1)",
      "toolbar_field": "rgba(19, 33, 64, 1)",
      "toolbar_field_text": "rgba(245, 245, 245, 1)"
    }
  }
}