Examine source code of Favorites — start page

{
  "manifest_version": 3,
  "name": "Favorites — start page",
  "version": "0.2.1",
  "description": "Your start page on every new tab. Syncs by a URL — no account, no login, no trackers.",
  "browser_specific_settings": {
    "gecko": {
      "id": "favorites@favorites.website",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://favorites.website/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://favorites.website/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Favorites",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    }
  }
}