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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 43.0a2:
  • Multiple monitors supported for WebRTC streaming
  • Service worker network interception via FetchEvent enabled
  • Subresource integrity allows developers to make their sites more secure
  • Show indicators in the Inspector markup view next to nodes that have pseudo-class locks set
  • New 'Use in Console' context menu item in more...


  • OS X 10.6 or later

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Current Version (43.x)


Downloads 16,987
Version Downloads 263
License Free
Date 27 Sep 2015
Platform Intel 64 / OS X / Intel 32
Price Free
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