Examine source code of 2B Nier Automata

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "2B Nier Automata",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(27, 40, 45, 0.31)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(49, 49, 49)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(135, 135, 135)",
      "popup": "rgba(27, 40, 45, 0.69)",
      "popup_text": "rgb(140, 140, 140)",
      "tab_loading": "rgb(135, 135, 135)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{91fad1d7-0591-4979-aa6f-b5217c1d1405}"
    }
  }
}