Examine source code of Email extract

{
  "manifest_version": 2,
  "minimum_chrome_version": "88.0",
  "name": "Email extract",
  "description": "Email Extract extension (Email Extractor tool) searches email addresses on pages you visit. Auto Search Mode automates search for emails on search engines.",
  "default_locale": "en",
  "version": "2.2.4",
  "icons": {
    "128": "icons/icon128.png"
  },
  "permissions": [
    "alarms",
    "storage",
    "unlimitedStorage",
    "identity"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "all_frames": true,
      "js": [
        "js/content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icons/icon128.png",
    "default_title": "Email extract",
    "default_popup": "popup.html"
  },
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAoBPlRJt8F8tiKJOlT0AecESYHxeZhPBzTLHyy8s5cVITBNoV9j/Jr3xutu5caEYWEBUQeWqgh23m0q0AeEWA6tH41+HxP80UnSQthqjstQG5/fonEwTTZOHCqmxFTAwepet85/qvT/vCbYl2IP5Z4Iry5wqzMuNDgKhuZHQE0sDwp61EZXyGDIX9KvWE02WlOCcnaA4OUL+j9LWJpwXqfQF13ZqSiwUHGF8XyuZ3t14XULzLrNMOeIiMcOU2yPNFW43TOLnVVinyfIm9I0UZM3ujXPN1B4bGBQXSiAjGeclggL4GAIgnkBjnJFicodhCRoNnlyd5wVqV9GnoDtTjIwIDAQAB",
  "browser_specific_settings": {
    "gecko": {
      "id": "{a958940d-dcbd-4d00-97af-7de12d83d75c}"
    }
  }
}