[Home](./index.md) > [puppeteer](./puppeteer.md) > [LaunchOptions](./puppeteer.launchoptions.md) > [extraPrefsFirefox](./puppeteer.launchoptions.extraprefsfirefox.md) ## LaunchOptions.extraPrefsFirefox property [Additional preferences](https://developer.mozilla.org/en-US/docs/Mozilla/Preferences/Preference_reference) that can be passed when launching with Firefox. Signature: ```typescript extraPrefsFirefox?: Record; ```