Examine source code of New Tab

{
  "manifest_version": 3,
  "name": "New Tab",
  "short_name": "New Tab",
  "author": "Nalinda Dissanayake",
  "developer": {
    "name": "Nalinda Dissanayake",
    "url": "https://nalinda.dev"
  },
  "description": "Make it yours. Enjoy life. Freedom with Firefox! Dynamic themes, task list, sweet greetings — set your wallpaper or use Bing. No ads, no tracking, full freedom. Have an awesome time!",
  "version": "1.3.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "homepage.pp@nalindard.github.io",
      "strict_min_version": "109.0"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage",
    "search",
    "bookmarks",
    "theme",
    "topSites",
    "tabs",
    "activeTab",
    "scripting"
  ],
  "optional_host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content-script.js"
      ]
    }
  ],
  "chrome_url_overrides": {
    "newtab": "new-tab/new-tab.html"
  },
  "action": {
    "default_title": "New Tab",
    "default_popup": "popup/popup.html",
    "default_icon": "icons/icon-256.png"
  },
  "background": {
    "scripts": [
      "./background/service-worker.js"
    ],
    "type": "module"
  }
}