Examine source code of Ironworx

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Ironworx",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg",
        "images/2.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top",
        "right center",
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(225, 234, 239, 0)",
      "toolbar_field": "rgba(255, 255, 255, 0.21)",
      "toolbar_field_text": "rgb(251, 251, 251)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(6, 6, 6)",
      "popup_text": "rgb(252, 252, 252)",
      "tab_loading": "rgb(255, 255, 255)",
      "bookmark_text": "rgb(254, 250, 251)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(255, 255, 255)"
    }
  }
}