Examine source code of Free Temp Mail Creator

{
  "name": "Free Temp Mail Creator - OwlyMail.com",
  "description": "Create free unlimited temporary mails to receive emails from any site.",
  "version": "1.0",
  "manifest_version": 2,
  "author": "OwlyMail.com",
  "icons": {
    "16": "/images/img16.png",
    "32": "/images/img32.png",
    "48": "images/img48.png",
    "128": "/images/img128.png"
  },
  "permissions": [
    "https://*.owlymail.com/",
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "/images/img16.png",
    "default_popup": "popup.html"
  }
}