Examine source code of The Maraduers Map

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "The Maraduers Map",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(29, 29, 47)",
      "toolbar_text": "rgb(247, 242, 245)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(5, 4, 4)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(7, 7, 10)",
      "tab_line": "rgb(250, 248, 246)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(4, 4, 5)",
      "tab_loading": "rgb(250, 248, 246)"
    }
  }
}