Examine source code of MacOS Dark Mode

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "MacOS Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(225, 234, 239, 0)",
      "toolbar_text": "rgb(231, 234, 234)",
      "frame": "rgb(176, 176, 176)",
      "tab_background_text": "rgb(203, 201, 201)",
      "toolbar_field": "rgb(111, 113, 113)",
      "toolbar_field_text": "rgb(241, 244, 244)",
      "tab_line": "rgb(139, 139, 139)",
      "popup": "rgb(119, 121, 121)",
      "popup_text": "rgb(245, 248, 248)",
      "tab_background_separator": "rgba(90, 90, 90, 0)",
      "tab_selected": "rgba(215, 213, 213, 0.19)",
      "tab_text": "rgb(238, 235, 235)",
      "toolbar_bottom_separator": "rgba(192, 192, 192, 0)",
      "toolbar_field_border": "rgba(96, 96, 96, 0)",
      "toolbar_field_separator": "rgba(104, 104, 104, 0.1)",
      "toolbar_top_separator": "rgba(204, 204, 204, 0)",
      "toolbar_vertical_separator": "rgb(135, 132, 132)",
      "tab_loading": "rgb(139, 139, 139)"
    }
  }
}