Examine source code of Auto Email Extractor

{
  "manifest_version": 3,
  "name": "Email Extractor and Saver",
  "version": "1.2",
  "description": "Extracts emails from web pages, saves them immediately, and displays all saved emails",
  "permissions": [
    "activeTab",
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "auto-email-extractor@example.com"
    }
  }
}