Examine source code of Monocle

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Monocle",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(33, 36, 43)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(25, 28, 33)",
      "tab_background_text": "rgb(140, 140, 140)",
      "toolbar_field": "rgb(46, 49, 60)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(255, 255, 255, 0.06)",
      "popup": "rgb(25, 28, 33)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(239, 76, 128)",
      "icons_attention": "rgb(239, 76, 128)",
      "popup_border": "rgb(239, 76, 128)",
      "sidebar": "rgb(25, 28, 33)",
      "tab_loading": "rgb(239, 76, 128)",
      "tab_selected": "rgb(31, 36, 42)",
      "toolbar_field_border_focus": "rgb(239, 76, 128)",
      "toolbar_field_highlight": "rgb(239, 76, 128)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{80c77ae2-d182-4c6a-99f4-35a2493a3582}"
    }
  }
}