Firefox Release

November 15, 2016

Version 50.0, first offered to Release channel users on November 15, 2016

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


  • Updates to keyboard shortcuts

    • Set a preference to have Ctrl+Tab cycle through tabs in recently used order
    • View a page in Reader Mode by using Ctrl+Alt+R (command+alt+r on Mac)
  • Added option to Find in page that allows users to limit search to whole words only

  • Added Guarani (gn) locale

  • Increased availability of WebGL to more than 98 percent of users on Windows 7 and newer

  • Added download protection for a large number of executable file types on Windows, Mac and Linux

  • Improved performance for SDK extensions or extensions using the SDK module loader

  • Playback video on more sites without plugins with WebM EME Support for Widevine on Windows and Mac



  • Added a built-in Emoji set for operating systems without native Emoji fonts (Windows 8.0 and lower and Linux)

  • Blocked versions of libavcodec older than 54.35.1

  • The link to check for plugin security updates has been removed from the addon manager as Firefox automatically checks for plugin updates


  • Firefox fails to log into Firefox Accounts or Sync if browser is set to "Never Remember History"

  • Due to an Apple touch bar bug, Firefox on recent MacBook Pro may crash when open for long periods or crash after resuming from sleep. Apple reports to have a fix for this in the currently unreleased OS X 10.12.3

All Firefox downloads