Examine source code of Gotongroyong.com Tab

{
  "manifest_version": 2,
  "version": "1.0.2",
  "name": "Gotongroyong.com Tab",
  "description": "Charity with your browser tab.",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "icons": {
    "36": "icons/36.png",
    "48": "icons/48.png",
    "192": "icons/192.png"
  },
  "background": {
    "scripts": [
      "script.js"
    ],
    "persistent": false
  }
}