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Firefox Developer Edition (was Aurora) is the rapid-fire release channel for the next iteration of the Firefox Web browser. The Developer channel is where users can test the latest features and innovations. Users can expect an increase in polish from the raw, cutting edge features in the nightly builds. These releases may not be as stable as beta or final releases.

With Firefox Developer Edition:
  • Experience the newest innovations in an unstable environment that's not for the faint of heart
  • Provide feedback on features and performance to help determine what makes the final release

What's New

Version 39.0a2:
  • NPAPI Plug-in performance improved via asynchronous initialization
  • Support for 'switch' role in ARIA 1.1
  • Disable use of RC4 except for temporarily whitelisted hosts
  • Removed support for insecure SSLv3 for network communications


  • OS X 10.6 or later

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Current Version (39.x)


Downloads 14,882
Version Downloads 190
License Free
Date 14 Apr 2015
Platform Intel 64 / OS X / Intel 32
Price Free