Examine source code of Smart Email Validator

{
  "name": "Smart Email Validator",
  "description": "A simple yet powerful email validation tool that checks for valid format, deliverability, free email services, and disposable addresses — all in real time",
  "version": "0.0.1",
  "manifest_version": 2,
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{eb7ca936-ec04-46d9-8f22-a4b6bdf140ae}"
    }
  }
}