Examine source code of User DNS Details

{
  "manifest_version": 2,
  "name": "User Current DNS Details and DNS Leak Test",
  "description": "Displays DNS info of user's DNS server used by browser and check for any DNS leak",
  "version": "1.1",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "browser_action": {
    "default_title": "Default Popup Title",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{80a90138-ba29-499d-b3dd-9f30861b37ed}"
    }
  }
}