Examine source code of Zaplook

{
  "manifest_version": 2,
  "name": "Zaplook",
  "description": "Permite sincronizar series/películas de servicios de suscripción",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.netflix.com/*"
      ],
      "js": [
        "player.js"
      ],
      "all_frames": true
    },
    {
      "matches": [
        "http://localhost/*",
        "https://zaplook-es.web.app/*",
        "https://zaplook.es/*"
      ],
      "js": [
        "check_extension.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "netflix.js"
  ],
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "https://www.netflix.com/",
    "http://localhost/*",
    "https://zaplook.es/",
    "https://zaplook-es.web.app/"
  ],
  "version": "1.1",
  "icons": {
    "48": "icon_48.png"
  }
}