Examine source code of ocu

{
  "manifest_version": 2,
  "name": "ocu-addon",
  "description": "La extensión OCUPlus está disponible para socios de OCU y te recordará qué sitios ofrecen reembolsos.",
  "version": "5.2",
  "icons": {
    "16": "icons/icon_16.png",
    "32": "icons/icon_32.png",
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "permissions": [
    "notifications"
  ],
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "background-script.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "browser-polyfill.js",
        "jquery-3.2.1.min.js",
        "content-script.js",
        "main.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "icons/ocu_header_logo.jpg"
  ],
  "default_locale": "en"
}