Advanced and experimental features

Learn tips beyond the basics and try features before they're released to the public.

How to enable Windows SSO login in Firefox

Use Windows single sign-on (SSO) to log in to Microsoft, work, and school accounts with credentials from your Windows 10 or 11 operating system.

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Configuration Editor for Firefox

The Configuration Editor (about:config page) lets you view, change, or reset advanced preference settings in Firefox. Learn more.

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Compact mode workaround in Firefox

Learn about a workaround to activate compact mode, if you need to. This feature isn't supported and we still recommend using normal mode.

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Resist Fingerprinting

Firefox's Advanced Preferences to resist fingerprinting can help prevent websites from uniquely identifying your device but can cause problems. Learn more.

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About Studies

How to opt out of studies

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Canary domain - use-application-dns.net

Network administrators may configure their networks to modify DNS requests for the following special-purpose domain, called a ''canary domain''.

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WebXR Permission Info Page

This article explains Firefox's virtual reality features and how to manage permissions for websites that ask to access your VR devices.

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Sync custom preferences

Firefox Sync allows you to sync your preference settings across all your Firefox Desktop devices. Learn more.

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