Firefox Beta and Developer Edition
Release Notes

Heartbeat user rating system - your feedback about Firefox

Bing search now uses HTTPS for secure searching

New preferences implementation enabled for the first half of the beta cycle

Improved protection against site impersonation via OneCRL centralized certificate revocation

Opportunistically encrypt HTTP traffic where the server supports HTTP/2 AltSvc

Disabled insecure TLS version fallback for site security

Improved certificate and TLS communication security by removing support for DSA

Added support for e-mail name constraints in certificates

Extended SSL error reporting for reporting non-certificate errors

TLS False Start optimization now requires a cipher suite using AEAD construction

Debug tabs opened in Chrome Desktop, Chrome for Android, and Safari for iOS

New Inspector animations panel to control element animations

New Security Panel included in Network Panel

Debugger panel support for chrome:// and about:// URIs

Added logging of weak ciphers to the web console

Implemented a subset of the Media Source Extensions (MSE) API to allow native HTML5 playback on YouTube (Windows Vista or later only)

WebSocket now available in Web Workers

Added support for CSS display:contents

IndexedDB now accessible from worker threads