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.

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

This page explains the technical documentation on how to control media in Firefox by using the Media Session API.

Fingerprinting Protection in Firefox protects you from websites that try to identify you based on a set of unique characteristics.

How to opt out of studies

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

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

Firefox 66 introduced DOM events changes for compatibility with legacy content. Learn more.

Advanced Firefox customization options, about:config and userChrome.css/userContent.css modifications, are not recommended. Learn more.

Learn to use Firefox's Eyedropper tool to identify and copy web color Hex values quickly – enhance projects with precise color matching.