Firefox Beta and Developer Edition
Release Notes

SVG images can be used as favicons

Enhance IME support on Windows (Vista +) using TSF (Text Services Framework)

Ability to set a profile picture for your Firefox Account

Firefox Hello now includes instant messaging

Picture element does not react to resize/viewport changes

Type 2 Add-ons (Extensions) that have not been signed by Mozilla will be disabled by default. Read more about Add-on signing in Firefox

Memory overhead of AdBlock Plus has been greatly reduced

WebRTC now requires perfect forward secrecy

Updates to image decoding process

WARP is disabled on Windows 7

Support for running animations of 'transform' and 'opacity' on the compositor thread

Removed support for binary XPCOM components in extensions, use addon SDK "system/child_process" pipe mechanism for native binaries instead

Network requests can be exported in HAR format

View HTML source in a tab

Quickly add new CSS rule with New Rule button in the Inspector

Screenshot a node or element from markup view with the Screenshot Node context menu item

Copy element CSS rule declarations with the Copy Rule Declaration context menu item in the Inspector

Pseudo-Class panel in the Inspector

MessageChannel and MessagePort API enabled by default

Added support for the transform-origin property on SVG elements

Copy/Cut Web content from JavaScript to the OS clipboard with document.execCommand("cut"/"copy")

Implemented Cache API for querying named caches that are accessible Window, Worker, and ServiceWorker

CSS Font Loading API enabled by default

Navigator.onLine now varies with actual internet connectivity (Windows and Mac OS X only)