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

September 20, 2016

Version 51.0a2, first offered to Firefox Developer Edition channel users on September 20, 2016

For more information about Developer Edition please see this MDN article.


  • Added support for FLAC (Free Lossless Audio Codec) playback

  • View passwords from the prompt before saving them

  • Zoom indicator is shown in the URL bar if the zoom level is not at default level

  • Improved video performance for users without GPU acceleration:

    • Less CPU Usage
    • Better full screen experience
  • Support saving passwords for forms without 'submit' events


  • Process separation (e10s) now supported on Windows 10 touch screen devices and systems with accessibility tools installed

  • Use Skia for content rendering (Linux)