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.
Last updated: 03/14/2023
Configuration Editor for Firefox
The Configuration Editor (about:config page) lets you view, change, or reset advanced preference settings in Firefox. Learn more.
Last updated: 06/15/2022
Firefox's protection against fingerprinting
Fingerprinting Protection in Firefox protects you from websites that try to identify you based on a set of unique characteristics.
Last updated: 10/01/2023
Control audio or video playback with your keyboard
This page explains the technical documentation on how to control media in Firefox by using the Media Session API.
Last updated: 08/21/2021
Use the Eyedropper tool in Firefox to sample colors
Learn to use Firefox's Eyedropper tool to identify and copy web color Hex values quickly – enhance projects with precise color matching.
Last updated: 04/22/2024
Sync custom preferences
Firefox Sync allows you to sync your preference settings across all your Firefox Desktop devices. Learn more.
Last updated: 06/17/2022
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''.
Last updated: 04/16/2022
DOM events changes introduced in Firefox 66
Firefox 66 introduced DOM events changes for compatibility with legacy content. Learn more.
Last updated: 07/09/2019
Firefox advanced customization and configuration options
Advanced Firefox customization options, about:config and userChrome.css/userContent.css modifications, are not recommended. Learn more.
Last updated: 1 week, 2 days ago
