Firefox Developer Edition
Release Notes

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

December 18, 2015

Version 45.0a2, first offered to Firefox Developer Edition channel users on December 18, 2015


  • Instant browser tab sharing through Hello

  • GTK3 integration (GNU/Linux only)

  • Tabs synced via Firefox Accounts from other devices are now shown in dropdown area of Awesome Bar when searching

  • Synced Tabs button in button bar

  • Introduce a new preference (network.dns.blockDotOnion) to allow blocking .onion at the DNS level

  • Guarani [gn] locale added


  • URLs containing a Unicode-format Internationalized Domain Name (IDN) are now properly redirected



Web Platform

All Firefox Developer Edition downloads