Examine source code of Personal Dashboard

{
  "manifest_version": 3,
  "name": "Personal Dashboard",
  "version": "1.0.0",
  "description": "Just for practicing async JS",
  "action": {
    "default_icon": "icon.png"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "scrimba-dashboard@haydendingman.com",
      "strict_min_version": "58.0"
    }
  }
}