Examine source code of attoVPN

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "attoVPN",
  "version": "0.0.1",
  "manifest_version": 2,
  "description": "attoVPN is a nice and simple VPN.",
  "homepage_url": "http://blank.org",
  "default_locale": "en",
  "background": {
    "scripts": [
      "src/bg/background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "attovpn",
    "default_popup": "src/browser_action/browser_action.html"
  },
  "permissions": [
    "tabs"
  ]
}