Examine source code of New TAB Redirect

{
  "manifest_version": 3,
  "name": "Redirect Extension",
  "version": "2.0",
  "description": "Redirects all pages to a specific URL.",
  "permissions": [
    "storage",
    "tabs"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "options_page": "options.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "freestartjoin@gmail.com"
    }
  },
  "action": {
    "default_title": "New Tab Redirect"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  }
}