Examine source code of Uno New Tab

{
  "manifest_version": 2,
  "name": "Uno New Tab",
  "description": "Cool new tab extension 😎",
  "version": "1.0.1",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_action": {
    "default_icon": "favicon.png"
  },
  "permissions": [
    "tabs"
  ]
}