Firefox Beta and Developer Edition
Release Notes

A set of new improvements to the Firefox user interface (learn more).

An interactive onboarding tour to guide users through new interface changes

A redesigned and improved customization mode

The ability to set up Firefox Sync by creating a Firefox account (learn more)

Gamepad API finalized and enabled

Malay [ma] locale added

navigator.plugins is no longer enumerable, for user privacy

Clicking on a W3C Web Notification will switch to the originating tab

'box-sizing' (dropping the -moz- prefix) implemented (learn more)

Console object available in Web Workers (learn more)

Promises enabled by default (learn more)

SharedWorker enabled by default

<input type="number"> implemented and enabled

<input type="color"> implemented and enabled

Enabled ECMAScript Internationalization API

Add-on bar has been removed, content moved to navigation bar

Mac OS X: cmd-L no longer opens a new window when no window is available (1008793)

Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1 has a workaround (see 812695)

Echo cancellation on apprtc.appspot.com fails (974537)

Exit is not always completed when "clear history when Firefox closes" is enabled (1005487)