Examine source code of Purple Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Purple Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top",
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(60, 62, 68)",
      "toolbar_text": "rgb(123, 127, 204)",
      "frame": "rgb(20, 22, 27)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(45, 49, 58)",
      "toolbar_field_text": "rgb(123, 127, 204)",
      "tab_line": "rgb(147, 152, 226)",
      "popup": "rgb(45, 49, 58)",
      "popup_text": "rgb(98, 102, 183)",
      "tab_loading": "rgb(147, 152, 226)"
    }
  }
}