Examine source code of Switch Scores

{
  "name": "Switch Scores",
  "description": "Adds Switch reviews infos in Nintendo website",
  "version": "0.8",
  "manifest_version": 2,
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png"
  },
  "permissions": [
    "https://www.switchscores.com/",
    "https://www.nintendo.co.uk/",
    "https://www.nintendo.fr/",
    "https://www.nintendo.de/",
    "https://www.nintendo.ch/",
    "https://www.nintendo.at/",
    "https://www.nintendo.be/",
    "https://www.nintendo.es/",
    "https://www.nintendo.nl/",
    "https://www.nintendo.it/",
    "https://www.nintendo.pt/",
    "https://www.nintendo.co.za/"
  ],
  "background": {
    "persistent": true,
    "scripts": [
      "jquery.js",
      "utils.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.switchscores.com/games/*"
      ],
      "js": [
        "jquery.js",
        "utils.js",
        "switchscore.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://www.nintendo.co.uk/Games/*",
        "https://www.nintendo.fr/Jeux/*",
        "https://www.nintendo.de/Spiele/*",
        "https://www.nintendo.ch/de/Spiele/*",
        "https://www.nintendo.ch/fr/Jeux/*",
        "https://www.nintendo.ch/it/Giochi/*",
        "https://www.nintendo.at/Spiele/*",
        "https://www.nintendo.be/fr/Jeux/*",
        "https://www.nintendo.be/nl/Games/*",
        "https://www.nintendo.es/Juegos/*",
        "https://www.nintendo.nl/Games/*",
        "https://www.nintendo.it/Giochi/*",
        "https://www.nintendo.pt/Jogos/*",
        "https://www.nintendo.co.za/Games/*"
      ],
      "js": [
        "jquery.js",
        "utils.js",
        "nintendo.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://www.nintendo.co.uk/Search/*",
        "https://www.nintendo.fr/Rechercher/*",
        "https://www.nintendo.de/Suche-/*",
        "https://www.nintendo.ch/de/Suche-/*",
        "https://www.nintendo.ch/fr/Rechercher/*",
        "https://www.nintendo.ch/it/Cerca/*",
        "https://www.nintendo.at/Suche-/*",
        "https://www.nintendo.be/fr/Rechercher/*",
        "https://www.nintendo.be/nl/Zoeken/*",
        "https://www.nintendo.es/Buscar/*",
        "https://www.nintendo.nl/Zoeken/*",
        "https://www.nintendo.it/Cerca/*",
        "https://www.nintendo.pt/Pesquisar/*",
        "https://www.nintendo.co.za/Search/*"
      ],
      "js": [
        "jquery.js",
        "utils.js",
        "nintendo-search.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://www.nintendo.co.uk/Official-UK-Store/Nintendo-eShop/Nintendo-eShop-Sale/*",
        "https://www.nintendo.fr/My-Nintendo-Store/Nintendo-eShop/Offres-du-Nintendo-eShop/*",
        "https://www.nintendo.de/My-Nintendo-Store/Nintendo-eShop/Nintendo-eShop-Aktion/*",
        "https://www.nintendo.ch/de/My-Nintendo-Store/Nintendo-eShop/Nintendo-eShop-Aktion/*",
        "https://www.nintendo.ch/fr/My-Nintendo-Store/Nintendo-eShop/Offres-du-Nintendo-eShop/*",
        "https://www.nintendo.ch/it/My-Nintendo-Store/Nintendo-eShop/Promo-Nintendo-eShop/*",
        "https://www.nintendo.at/My-Nintendo-Store/Nintendo-eShop/Nintendo-eShop-Aktion/*",
        "https://www.nintendo.be/fr/My-Nintendo-Store/Nintendo-eShop/Offres-du-Nintendo-eShop/*",
        "https://www.nintendo.be/nl/My-Nintendo-Store/Nintendo-eShop/Nintendo-eShop-actie/*",
        "https://www.nintendo.es/My-Nintendo-Store/Nintendo-eShop/Ofertas-de-Nintendo-eShop/*",
        "https://www.nintendo.nl/My-Nintendo-Store/Nintendo-eShop/Nintendo-eShop-actie/*",
        "https://www.nintendo.it/My-Nintendo-Store/Nintendo-eShop/Promo-Nintendo-eShop/*",
        "https://www.nintendo.pt/My-Nintendo-Store/Nintendo-eShop/Promocoes-da-Nintendo-eShop/*",
        "https://www.nintendo.co.za/Shopping/Nintendo-eShop/Nintendo-eShop-Sale/*"
      ],
      "js": [
        "jquery.js",
        "utils.js",
        "nintendo-eshop-promos.js"
      ],
      "run_at": "document_idle"
    }
  ]
}