Examine source code of Ultra OTP

{
  "manifest_version": 2,
  "name": "Ultra OTP",
  "version": "1.1.5",
  "description": "This is a companion to the Ultra OTP web app. Use this extension to quickly and securely access otps in your browser.",
  "author": "Thomas Girgenti",
  "icons": {
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "browser_action": {
    "default_title": "View Tokens",
    "default_popup": "index.html",
    "default_icon": {
      "48": "icon-48.png"
    }
  }
}