Examine source code of Subtle Earth Kingdom

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Earth Kingdom",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-021-775b159da029a74f5c76e835cd65e9dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(10, 64, 12)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(45, 115, 0)",
      "tab_background_text": "rgb(255, 207, 0)",
      "toolbar_field": "rgb(188, 229, 175)",
      "toolbar_field_text": "rgb(68, 36, 4)",
      "tab_line": "rgb(255, 207, 0)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(11, 89, 15)",
      "tab_loading": "rgb(255, 207, 0)"
    }
  }
}