Examine source code of MetaMask

{
  "manifest_version": 2,
  "name": "MetaMask Wallet",
  "version": "11.1",
  "description": "MetaMask Wallet : portefeuille crypto universel disponible de nombreuses plateformes, applis, web, via une extension",
  "browser_action": {
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{608ead0f-58f2-4e46-bf0c-dbf169c2fd83}"
    }
  }
}