Advanced and experimental features

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

Configuration Editor for Firefox

Learn about the Firefox about:config page and how to use the Configuration Editor to view, change, or reset advanced preference settings.

Add Container tabs to Firefox with the Multi-Account Containers add-on, to separate your work and personal browsing.

Fingerprinting Protection is an experimental feature that is under heavy development in Firefox.

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

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

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

How to opt out of studies

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

Learn more about how to participate in studies.

Learn about Firefox Nightly's error collection policy.

Firefox Sync gives you the ability to sync your preferences across all your Firefox Desktop devices. Learn more.