Examine source code of Dark Blue

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Dark Blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(70, 70, 70)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(14, 65, 94)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(28, 28, 28)",
      "toolbar_field_text": "rgb(123, 127, 204)",
      "tab_line": "rgb(112, 182, 248)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(191, 191, 191)",
      "button_background_active": "rgb(55, 55, 55)",
      "button_background_hover": "rgb(59, 59, 59)",
      "frame_inactive": "rgb(44, 44, 44)",
      "icons_attention": "rgb(68, 68, 68)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(8, 35, 51)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(0, 0, 0)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "popup_highlight": "rgb(96, 96, 96)",
      "sidebar_border": "rgb(0, 0, 0)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgb(0, 0, 0)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(8, 39, 57)",
      "tab_background_separator": "rgb(64, 64, 64)",
      "tab_loading": "rgb(174, 174, 174)",
      "tab_selected": "rgb(9, 41, 59)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(0, 0, 0)",
      "toolbar_field_border_focus": "rgb(0, 0, 0)",
      "toolbar_field_border": "rgb(0, 0, 0)",
      "toolbar_field_focus": "rgb(33, 33, 33)",
      "toolbar_field_highlight_text": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgba(112, 182, 248, 0.27)",
      "toolbar_field_separator": "rgb(0, 0, 0)",
      "toolbar_field_text_focus": "rgb(233, 233, 233)",
      "toolbar_top_separator": "rgb(0, 0, 0)",
      "toolbar_vertical_separator": "rgb(0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0fd1f17c-b94b-4298-bd3b-0b609bc0a1cc}"
    }
  }
}