Examine source code of CashDiscounter

{
  "manifest_version": 3,
  "name": "CashDiscounter",
  "short_name": "CashDiscounter",
  "version": "1.0.0",
  "description": "Verdien automatisch cashback bij honderden Nederlandse webshops. Kortingscodes, cashback-alerts en meer — direct in je browser.",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    },
    "default_title": "CashDiscounter"
  },
  "background": {
    "scripts": [
      "lib/browser-polyfill.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "exclude_matches": [
        "https://cashdiscounter.nl/*",
        "https://*.cashdiscounter.nl/*",
        "https://api.cashdiscounter.nl/*"
      ],
      "js": [
        "lib/browser-polyfill.js",
        "content/content.js"
      ],
      "css": [
        "content/content.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://cashdiscounter.nl/*"
      ],
      "js": [
        "lib/browser-polyfill.js",
        "content/auth-sync.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": false,
    "browser_style": false
  },
  "permissions": [
    "storage",
    "tabs",
    "alarms",
    "activeTab",
    "notifications"
  ],
  "host_permissions": [
    "https://api.cashdiscounter.nl/*",
    "http://*/*",
    "https://*/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "icons/*",
        "lib/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@cashdiscounter.nl",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}