Examine source code of Windows 10 Default Blue

{
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "windows-10-default-blue@qw.linux-2g64.local"
    }
  },
  "name": "Windows 10 Default Blue",
  "version": "2.1",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "empty.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "#F9F9FA",
      "toolbar_field": "#FFFFFF",
      "toolbar_field_text": "#000000",
      "toolbar_top_separator": "#005496",
      "toolbar_bottom_separator": "#E1E1E2",
      "toolbar_vertical_separator": "#E3E3E3",
      "frame": "#0078D7",
      "tab_background_text": "#FFFFFF",
      "bookmark_text": "#000000"
    }
  }
}