Examine source code of WAGBPro

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "WAGBPro",
  "description": "WAGBPro - Site que fornece a versão mais recente para Whatsapp GB",
  "version": "1.0",
  "chrome_url_overrides": {
    "newtab": "newpage.html"
  },
  "browser_action": {
    "default_icon": "icon.png"
  },
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  }
}