Examine source code of Tile Dashboard - New Tab

{
  "manifest_version": 2,
  "name": "Tile Dashboard - New Tab",
  "short_name": "TileDash",
  "version": "1.2.3",
  "description": "Beautiful customizable new tab page with live tiles, custom search, and drag-and-drop organization.",
  "author": "JTechMe",
  "homepage_url": "https://jtechme.dev/tile-dashboard-extension",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "{f1188131-4590-4f48-ac43-35cd0ac2e375}"
    }
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "optional_permissions": [
    "https://*/*",
    "http://*/*"
  ],
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "web_accessible_resources": [
    "newtab.js",
    "icons/*.png"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  }
}