See what’s new in Firefox!

Release Notes tell you what’s new in Firefox. As always, we welcome your feedback. You can also file a bug in Bugzilla or see the system requirements of this release.

Firefox Developer Edition — English (US)

Your system may not meet the requirements for Firefox, but you can try one of these versions:

Firefox Developer Edition — English (US)

Your system doesn't meet the requirements to run Firefox.

Your system doesn't meet the requirements to run Firefox.

Please follow these instructions to install Firefox.

Firefox Privacy Notice


Firefox Aurora

February 7, 2014

Version 29.0a2, first offered to Aurora channel users on February 7, 2014


  • A set of new improvements to the Firefox user interface (learn more).

  • An interactive onboarding tour to guide users through new interface changes

  • A redesigned and improved customization mode

  • The ability to set up Firefox Sync by creating a Firefox account (learn more)


  • navigator.plugins is no longer enumerable, for user privacy


  • 'box-sizing' (dropping the -moz- prefix) implemented (learn more)

  • Console object available in Web Workers (learn more)

  • Promises enabled by default (learn more)

  • SharedWorker enabled by default

  • <input type="number"> implemented and enabled

  • Enabled ECMAScript Internationalization API

  • Add-on bar has been removed, content moved to navigation bar

Developer Information


  • Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1 has a workaround (see 812695)