Examine source code of Invisible Electro

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Invisible Electro",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg",
        "images/2.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center",
        "right center",
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(1, 3, 5)",
      "toolbar_text": "rgb(240, 65, 99)",
      "frame": "rgb(111, 100, 102)",
      "tab_background_text": "rgb(230, 235, 237)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(20, 24, 55)",
      "tab_line": "rgb(248, 112, 140)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(38, 38, 47)",
      "tab_loading": "rgb(248, 112, 140)"
    }
  }
}