Firefox Beta

February 26, 2015

Version 37.0beta, first offered to Beta channel users on February 26, 2015


  • 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


Web Platform

  • 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

All Firefox Beta downloads