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Firefox Beta and Developer Edition
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.

61.0beta Firefox Beta

May 9, 2018

Version 61.0beta, first offered to Beta channel users on May 9, 2018


  • Performance Enhancements:

    • Quantum CSS improvements which improve page rendering times
    • Improved page rendering speed with the new retained display list feature
    • Faster switching between tabs on Windows and Linux
    • WebExtensions now run in their own process on MacOS
  • On-by-default support for the latest draft of the TLS 1.3 specification

  • Various improvements for dark theme support will provide a more consistent experience across the entire Firefox UI

  • Added the ability to share current the URL with MacOS sharing providers from the Page Actions menu

  • OpenSearch plugins offered by web pages can now be added from the page action menu for easier installation

  • Improved support for allowing WebExtensions to manage and hide tabs


  • The settings for customizing your homepage and new tab page in Firefox have been moved to a new Preferences section, Home. It can be accessed from the sidebar in Preferences or by visiting about:preferences#home

  • In order to improve user security, access to FTP subresources inside http(s) pages has been blocked


  • A new drop down menu was added to the Developer Tools Network panel to allow bandwidth throttling, rather than requiring users to do so via Responsive Design Mode

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