Examine source code of GeoguessRating

{
  "manifest_version": 2,
  "name": "GeoguessRating",
  "description": "The best way to experience GeoGuessr. Track your games, visualize your stats, and understand when to play and the modes to improve.",
  "version": "2.0.1",
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "geoguessrating@gmail.com"
    }
  },
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "service-workers/service-worker.js"
    ],
    "type": "module"
  },
  "browser_action": {
    "default_popup": "popup/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.geoguessr.com/*"
      ],
      "js": [
        "browser-polyfill.js",
        "content_scripts/manager.js"
      ]
    },
    {
      "matches": [
        "https://api.geoguessrating.com/payment/success-co*",
        "https://api.geoguessrating.com/payment/cancel-co*",
        "https://api.geoguessrating.com/user/link-customer*"
      ],
      "js": [
        "browser-polyfill.js",
        "content_scripts/geoguessrating-redirect.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "_locales/*/messages.json"
  ],
  "default_locale": "en"
}