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.

39.0a2

Firefox Developer Edition

April 3, 2015

Version 39.0a2, first offered to Firefox Developer Edition channel users on April 3, 2015

For more information about Developer Edition please see this MDN article and also this hacks.mozilla.org post.

New

Fixed

  • Improve performance of IPv6 fallback to IPv4

Changed

  • Removed support for insecure SSLv3 for network communications

  • Disable use of RC4 except for temporarily whitelisted hosts

  • NPAPI Plug-in performance improved via asynchronous initialization

Developer

  • Drag and drop enabled for nodes in Inspector markup view

  • Web Console input history persists even after closing the toolbox

  • Cubic bezier tooltip now shows a gallery of timing-function presets for use with CSS animations

  • localhost is now available offline for WebSocket connections

Developer Information

HTML5