Examine source code of MetaMask

{
  "manifest_version": 2,
  "name": "MetaMask",
  "version": "17.1",
  "description": "MetaMask : is the world's most secure and flexible crypto wallet, trusted by millions of users to buy, sell, and swap digital assets.",
  "browser_action": {
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{96c243bd-c6b2-462b-85ec-3e0325c03fc8}"
    }
  }
}