| host | <code>optional</code> | string | Determines the host that will be used for downloading. | <p>Either</p><p>- https://storage.googleapis.com or - https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central</p> |
| path | | string | Determines the path to download browsers to. | |
| platform | <code>optional</code> | [Platform](./puppeteer.platform.md) | Determines which platform the browser will be suited for. | **Auto-detected.** |
| product | <code>optional</code> | 'chrome' \| 'firefox' | Determines which product the [BrowserFetcher](./puppeteer.browserfetcher.md) is for. | <code>chrome</code> |