Firefox Release

January 24, 2017

Version 51.0, first offered to Release channel users on January 24, 2017

We'd also like to extend a special thank you to all of the new Mozillians who contributed to this release of Firefox!


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

  • Users can view passwords in the save password prompt before saving them

  • Added a zoom button in the URL bar:

    • Displays percent above or below 100 percent when a user has changed the page zoom setting from the default
    • Lets users return to the default setting by clicking on the button
  • Improved video performance for users without GPU acceleration for less CPU usage and a better full screen experience

  • Firefox will save passwords even in forms that do not have “submit” events

  • Added support for WebGL 2, with advanced graphics rendering features like transform feedback, improved texturing capabilities, and a new sophisticated shading language

  • A warning is displayed when a login page does not have a secure connection

  • Added Georgian (ka) and Kabyle (kab) locales

  • An even faster E10s! Tab Switching is better!

  • Improved reliability of browser data sync

  • Remove Belarusian (be) locale



  • Use 2D graphics library (Skia) for content rendering on Linux

  • Re-enabled E10s support for Russian (ru) locale

  • Updated to NSS 3.28.1


All Firefox downloads