Examine source code of Nordic Dark

{
  "manifest_version": 2,
  "version": "3.0",
  "name": "Nordic Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(59, 66, 82)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(31, 35, 43)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(31, 35, 43)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(53, 60, 74)",
      "popup": "rgb(38, 43, 53)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(31, 35, 43)",
      "button_background_hover": "rgb(46, 52, 64)",
      "ntp_background": "rgb(23, 26, 32)",
      "popup_border": "rgb(31, 35, 43)",
      "sidebar_border": "rgb(31, 35, 43)",
      "sidebar": "rgb(38, 43, 53)",
      "tab_background_separator": "rgb(31, 35, 43)",
      "tab_loading": "rgb(19, 22, 26)",
      "tab_selected": "rgb(59, 66, 82)",
      "toolbar_bottom_separator": "rgb(31, 35, 43)",
      "toolbar_field_border_focus": "rgb(93, 99, 112)",
      "toolbar_field_border": "rgb(38, 43, 53)",
      "toolbar_field_focus": "rgb(38, 43, 53)",
      "toolbar_field_highlight": "rgb(93, 99, 112)",
      "toolbar_top_separator": "rgb(31, 35, 43)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{736d761a-7282-47b9-9555-596ea4b7c54e}"
    }
  }
}