Examine source code of Gregmat random GRE word

{
  "manifest_version": 2,
  "name": "Gregmat random GRE word",
  "version": "1.0.2",
  "description": "Random gre words on opening new tab",
  "developer": {
    "name": "Xatta Trone",
    "url": "https://github.com/Xatta-Trone"
  },
  "icons": {
    "48": "img/favicon64x64.png",
    "96": "img/favicon64x64.png"
  },
  "permissions": [
    "storage"
  ],
  "chrome_url_overrides": {
    "newtab": "index.html"
  }
}