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Firefox Release Notes

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.

50.0 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

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