Examine source code of Unauth App

{
  "manifest_version": 2,
  "name": "Unauth App",
  "author": "Arshad Kazmi",
  "version": "0.0.0.4",
  "description": "Unauth cross browser extension client to share website sessions",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "Unauth App",
    "default_icon": "logo192.png"
  },
  "permissions": [
    "tabs",
    "<all_urls>",
    "cookies"
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "96": "icon96.png",
    "128": "icon128.png"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'"
}