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.
Configuration Editor for Firefox
The Configuration Editor (about:config page) lets you view, change, or reset advanced preference settings in Firefox. Learn more.
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.
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.
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.
Sync custom preferences
Firefox Sync allows you to sync your preference settings across all your Firefox Desktop devices. Learn more.
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''.
DOM events changes introduced in Firefox 66
Firefox 66 introduced DOM events changes for compatibility with legacy content. Learn more.
Firefox advanced customization and configuration options
Advanced Firefox customization options, about:config and userChrome.css/userContent.css modifications, are not recommended. Learn more.