Examine source code of Purple Earth

{
  "manifest_version": 2,
  "version": "3.0",
  "name": "Purple Earth",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(109, 19, 158, 0.2)",
      "toolbar_field": "rgba(32, 7, 46, 0.5)",
      "toolbar_field_text": "rgb(221, 221, 221)",
      "tab_line": "rgb(221, 221, 221)",
      "popup": "rgb(32, 7, 46)",
      "popup_text": "rgb(221, 221, 221)",
      "tab_loading": "rgb(221, 221, 221)",
      "bookmark_text": "rgb(221, 221, 221)",
      "frame": "rgb(27, 5, 35)",
      "tab_background_text": "rgb(221, 221, 221)"
    }
  }
}