Examine source code of Crypto Price Tab

{
  "manifest_version": 2,
  "name": "Crypto Price Tab",
  "version": "1.0",
  "description": "Replace the New Tab page with a live cryptocurrency price chart.",
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "https://api.coindesk.com/*"
  ],
  "chrome_url_overrides": {
    "newtab": "popup.html"
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6ba38c1d-c2e8-4b91-9277-bf18870793c1}"
    }
  }
}