Examine source code of ¿ Que Comprar ?

{
  "manifest_version": 2,
  "name": "¿Que Comprar?",
  "short_name": "QueComprar",
  "homepage_url": "https://quecomprar.org/",
  "description": "Los mejores productos elegidos para vosotros",
  "version": "1",
  "background": {
    "scripts": [
      "event.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Que Comprar",
    "default_popup": "popup.html"
  },
  "permissions": [
    "tabs",
    "https://quecomprar.org/*"
  ]
}