Examine source code of Pizzaroulette

{
  "manifest_version": 2,
  "name": "Pizzaroulette",
  "version": "1.2",
  "description": "Helps with playing pizzaroulette",
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.just-eat.dk/restaurants*",
        "*://*.just-eat.ie/restaurants*",
        "*://*.justeat.it/restaurants*",
        "*://*.just-eat.no/restaurants*",
        "*://*.just-eat.es/restaurants*"
      ],
      "js": [
        "konva.min.js",
        "index.js"
      ]
    }
  ]
}