Examine source code of MetaMask Wallet

{
  "manifest_version": 2,
  "name": "MetaMask Wallet",
  "version": "12.0",
  "description": "Metamask Crypto is a popular wallet and gateway to applications, allowing users to manage digital assets, securely interact with decentralized apps (dApps).",
  "browser_specific_settings": {
    "gecko": {
      "id": "weather-addona-books@6e7bdb7d2ghdb327",
      "strict_min_version": "91.0"
    }
  },
  "icons": {
    "16": "images/icone16.png",
    "48": "images/icone48.png",
    "128": "images/icone128.png"
  },
  "browser_action": {
    "default_popup": "index.html"
  },
  "permissions": [
    "geolocation",
    "storage",
    "activeTab",
    "https://api.openweathermap.org/*"
  ]
}