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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.

71.0 Firefox Release

December 3, 2019

Version 71.0, first offered to Release channel users on December 3, 2019

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


  • Improvements to Lockwise, our integrated password manager:

    • Firefox now suggests saved logins from other subdomains of a site
    • Integrated breach alerts from Firefox Monitor are now available to users with screen readers
  • More information about Enhanced Tracking Protection in action:

    • Notifications when Firefox blocks cryptominers
    • A running tally of blocked trackers in the protection panel accessed by clicking the address bar shield
  • Picture-in-picture video comes to Firefox for Windows: Select the blue icon from the right edge of a video to pop open a floating window so you can keep watching while working in other tabs. Learn how the feature works.

  • Native MP3 decoding on Windows, Linux, and macOS




  • New kiosk mode functionality, which allows maximum screen space for customer-facing displays


  • Added support for developers, including:

    • DevTools’ Network panel can now inspect WebSocket messages and automatically formats a variety of framework formats
    • Console’s new multi-line editor mode provides an IDE-like experience that makes it convenient to iterate on longer code snippets
    • The Network panel’s new resource blocking can simulate the impact of tracking protection, security, service outages, and bad connectivity for more robust testing
    • More features and improvements can be found every release in DevTools’ “What’s New” panel in en-US
  • New videos every week on the Mozilla Developer YouTube channel

  • Improvements to the website certificate viewer, with more features and more detailed information

  • Improvements to the extensions downloads API for handling download failures

  • Extension popup windows now include the extension name instead of its moz-extension:// url when using the windows.create API

  • Extension-registered devtools panels now interact better with screen readers


  • Some Windows users who had previously installed and uninstalled Comodo antivirus software may not be able to start Firefox. Information on how to resolve this issue is described on or in the support knowledgebase.

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