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Firefox Beta

September 2, 2014

Version 33.0beta, first offered to Beta channel users on September 2, 2014


  • OpenH264 support (sandboxed)

  • Enhanced Tiles

  • Continued experimentation with WebRTC-powered communications feature

  • Improved search experience through the location bar

  • Windows: OMTC enabled by default

  • Slimmer and faster JavaScript strings

  • Search suggestions on the Firefox Start (about:home) and new tab (about:newtab) pages

  • Support for connecting to HTTP proxy over HTTPS

  • New CSP (Content Security Policy) backend

  • Improved reliability of the session restoration

  • Azerbaijani [az] locale added



Developer Information

Web Platform

  • DOMMatrix interface implemented

  • @counter-style rule from CSS3 Counter Styles specification implemented

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

  • WebCrypto: wrapKey and unwrapKey implemented

  • WebCrypto: Import/export of JWK-formatted keys


  • Fix incomplete downloads being marked as complete by detecting broken HTTP1.1 transfers (237623)

  • PDF.js: With some images, wrong colors could show up. Affects a very small number of PDF