Examine source code of nord-goose

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "nord-goose",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(41, 46, 57, 0.95)",
      "toolbar_text": "rgb(216, 222, 233)",
      "frame": "rgb(41, 46, 57)",
      "tab_background_text": "rgb(216, 222, 233)",
      "toolbar_field": "rgb(41, 46, 57)",
      "toolbar_field_text": "rgb(236, 239, 244)",
      "tab_line": "rgba(76, 86, 106, 0)",
      "popup": "rgb(41, 46, 57)",
      "popup_text": "rgb(216, 222, 233)",
      "button_background_active": "rgb(76, 86, 106)",
      "button_background_hover": "rgb(76, 86, 106)",
      "frame_inactive": "rgb(46, 52, 64)",
      "icons_attention": "rgb(94, 129, 172)",
      "icons": "rgb(216, 222, 233)",
      "ntp_background": "rgb(41, 46, 57)",
      "ntp_text": "rgb(236, 239, 244)",
      "popup_border": "rgb(94, 129, 172)",
      "popup_highlight_text": "rgb(143, 188, 187)",
      "popup_highlight": "rgb(59, 66, 82)",
      "sidebar_border": "rgba(94, 129, 172, 0)",
      "sidebar_highlight_text": "rgb(143, 188, 187)",
      "sidebar_highlight": "rgb(67, 76, 94)",
      "sidebar_text": "rgb(216, 222, 233)",
      "sidebar": "rgb(41, 46, 57)",
      "tab_background_separator": "rgba(255, 0, 4, 0)",
      "tab_loading": "rgb(76, 86, 106)",
      "tab_selected": "rgb(59, 66, 82)",
      "tab_text": "rgb(236, 239, 244)",
      "toolbar_bottom_separator": "rgb(46, 52, 64)",
      "toolbar_field_border_focus": "rgb(129, 161, 193)",
      "toolbar_field_border": "rgba(46, 52, 64, 0)",
      "toolbar_field_focus": "rgb(41, 46, 57)",
      "toolbar_field_highlight_text": "rgb(129, 161, 193)",
      "toolbar_field_highlight": "rgb(67, 76, 94)",
      "toolbar_field_separator": "rgb(76, 86, 106)",
      "toolbar_field_text_focus": "rgb(236, 239, 244)",
      "toolbar_top_separator": "rgba(255, 0, 4, 0)",
      "toolbar_vertical_separator": "rgb(76, 86, 106)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d8b1c834-8874-43e5-9a4a-3802a55d86d4}"
    }
  }
}