puppeteer/website/versioned_docs/version-19.1.0/api/puppeteer.launchoptions.extraprefsfirefox.md

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---
sidebar_label: LaunchOptions.extraPrefsFirefox
---
# LaunchOptions.extraPrefsFirefox property
[Additional preferences](https://searchfox.org/mozilla-release/source/modules/libpref/init/all.js) that can be passed when launching with Firefox.
**Signature:**
```typescript
interface LaunchOptions {
extraPrefsFirefox?: Record<string, unknown>;
}
```