Firefox Beta and Developer Edition
Release Notes

Firefox Hello real-time communication client

Easily switch themes/personas directly in the Customizing mode

Wikipedia search now uses HTTPS for secure searching (en-US only)

Implementation of HTTP/2 (draft14) and ALPN

Recover from a locked Firefox process in the "Firefox is already running" dialog on Windows

CSS transitions start correctly when started at the same time as changes to display, position, overflow, and similar properties

WebIDE: Create, edit, and test a new Web application from your browser

Highlight all nodes that match a given selector in the Style Editor and the Inspector's Rules panel

Improved User Interface of the Profiler

console.table function added to web console

Support for the ECMAScript 6 Symbol data type added

ECMAScript 6 WeakSet Implemented

JavaScript Template Strings Implemented

CSS3 Font variants and features control (e.g. kerning) implemented

WebCrypto: RSA-OAEP, PBKDF2 and AES-KW support

WebCrypto: wrapKey and unwrapKey implemented

WebCrypto: Import/export of JWK-formatted keys

matches() DOM API implemented (formerly mozMatchesSelector())

Performance.now() for workers implemented

WebCrypto: ECDH support

Windows: On some combination of hardware and drivers, the main window could be black. In this case, update your graphics drivers (1083071)