Examine source code of Marvel-Silver Age

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Marvel-Silver Age",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right bottom",
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(78, 74, 74, 0.49)",
      "toolbar_text": "rgb(238, 241, 244)",
      "frame": "rgb(12, 12, 12)",
      "tab_background_text": "rgb(245, 250, 254)",
      "toolbar_field": "rgba(0, 0, 0, 0.44)",
      "toolbar_field_text": "rgb(245, 250, 254)",
      "tab_line": "rgb(248, 7, 50)",
      "popup": "rgb(1, 17, 124)",
      "popup_text": "rgb(7, 144, 184)",
      "tab_loading": "rgb(248, 7, 50)"
    }
  }
}