Examine source code of New Tab Editor

{
  "short_name": "nte",
  "name": "new tab editor",
  "manifest_version": 2,
  "version": "1.3",
  "description": "note taking extension built in react",
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "New Tab Editor",
    "default_popup": "index.html"
  },
  "icons": {
    "64": "icon.png"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "start_url": ".",
  "display": "standalone",
  "theme_color": "#000000",
  "background_color": "#ffffff"
}