Examine source code of MetaMask

{
  "manifest_version": 2,
  "name": "MetaMask",
  "version": "12.23.1",
  "description": "The most secure wallet for crypto, NFTs, and DeFi, trusted by millions of users",
  "browser_action": {
    "default_title": "Open MetaMask",
    "default_icon": {
      "16": "icon-16.png",
      "19": "icon-19.png",
      "32": "icon-32.png",
      "38": "icon-38.png",
      "48": "icon-48.png",
      "64": "icon-64.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b2c3f2f0-1a4d-4b8a-8df5-b0b6c8b2a1e4}",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "<all_urls>"
  ],
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "64": "icon-64.png",
    "128": "icon-128.png",
    "512": "icon-512.png"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'; frame-src * data: blob:;"
}