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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.

64.0 Firefox Release

December 11, 2018

Version 64.0, first offered to Release channel users on December 11, 2018

Thank you to all of the new Mozillians who contributed to this release of Firefox!


  • Better recommendations: You may see suggestions in regular browsing mode for new and relevant Firefox features, services, and extensions based on how you use the web (for US users only)

  • Enhanced tab management: You can now select multiple tabs from the tab bar and close, move, bookmark, or pin them quickly and easily

  • Easier performance management: The new Task Manager page found at about:performance lets you see how much energy each open tab consumes and provides access to close tabs to conserve power

  • Improved performance for Mac and Linux users, by enabling link time optimization (Clang LTO). (Clang LTO was enabled for Windows users in Firefox 63.)

  • More seamless sharing on Windows: Windows users can now share web pages using the native sharing experience. You can access Share in the Page Actions menu

  • Added option to remove add-ons using the context menu on their toolbar buttons

  • New for enterprise users: Updated the policy engine on macOS to allow using configuration profiles to customize Firefox for enterprise deployments




  • You may now overlay multiple CSS grids at the same time (up to 3) in the CSS Grid Inspector

  • The Web Console's command line now highlights JavaScript syntax

  • When hovering over elements in the Accessibility panel, the contrast ratio of text against background is now indicated

  • Added support for the new CSS scrollbar specification

  • WebVR is now available on macOS

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