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Mozilla Firefox 64.0

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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

Various security fixes

RSS feed preview and live bookmarks are available only via add-ons

TLS certificates issued by Symantec are no longer trusted by Firefox. Website operators are strongly encouraged to replace any remaining Symantec TLS certificates as soon as possible.

about:crashes has been redesigned to make it clear when a crash is being submitted to Mozilla, as well as being clear that removing crashes locally does not remove them from crash-stats.mozilla.com

The macOS keyboard shortcut to add "www" and ".com" to a URL is now ctrl-enter instead of ⌘[cmd]-enter

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

Mozilla Firefox 63.0.3

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Firefox Release
November 15, 2018

Version 63.0.3, first offered to Release channel users on November 15, 2018
Games using WebGL (created in Unity) get stuck after very short time of gameplay (bug 1502748)

Slow page loading for some users with specific proxy configurations (bug 1495024)

Disable HTTP response throttling by default for causing bugs with videos in background tabs (bug 1503354)

Opening magnet links no longer works (bug 1498934)

Crash fixes (bug 1498510, bug 1503424)

developerDeveloper Information

Mozilla Firefox 63.0

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Firefox Release
October 23, 2018

Version 63.0, first offered to Release channel users on October 23, 2018
Performance and visual improvements for Windows users

Moved the build infrastructure of Firefox on Windows to the Clang toolchain, bringing important performance gains
Firefox theme now matches the Windows 10 OS Dark and Light modes
Performance improvements for macOS users

Improved reactivity
Faster tab switching
WebGL power preferences allow non-performance-critical applications and applets to request the low-power GPU instead of the high-power GPU in multi-GPU systems
Added content blocking, a collection of Firefox settings that offer users greater control over technology that can track them around the web. In 63, users can opt to block third-party tracking cookies or block all trackers and create exceptions for trusted sites that don’t work correctly with content blocking enabled.

WebExtensions now run in their own process on Linux

Firefox now warns about having multiple windows and tabs open when quitting from the main menu. The Save and Quit feature has been removed. You can restore your session by ticking the box for Restore previous session in the General → Startup options or by using Restore Previous Session in the main menu.

Firefox now recognizes the operating system accessibility setting for reducing animation

Added search shortcuts for Top Sites: Amazon and Google appear as Top Sites tiles on the Firefox Home (New Tab) page. When selected these tiles will change focus to the address bar to initiate a search. Currently in US only.

Resolved an issue that prevented the address bar from autofilling bookmarked URLs in certain cases

Various security fixes

In the Library, the Open in Sidebar feature for individual bookmarks was removed

The option to Never check for updates was removed from about:preferences. You can use the DisableAppUpdate enterprise policy as a substitute.

The Ctrl+Tab shortcut now displays thumbnail previews of your tabs and cycles through tabs in recently used order. This new default behavior is activated only in new profiles and can be changed in preferences.

Refreshed visual style of Developer Tools menus to improve navigation and consistency

The Dev Tools accessibility inspector is now enabled by default. This tool surfaces information exposed to assistive technologies on the current page, allowing you to check what’s missing or otherwise needs attention.

Added support for Web Components custom elements and shadow DOM

The inspector now ships with a Font Editor that allows you to control non-variable as well as variable fonts

Developer Information
Quick Heal internet security software might crash 32-bit Firefox on Windows. A workaround is documented from this support article until a fixed version of Quick Heal is available.

Mozilla Firefox 62.0.3

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Version 62.0.3, first offered to Release channel users on October 2, 2018



  • Fixed hangs on macOS Mojave (10.14) when various dialog windows (upload, download, print, etc) are activated (bug 1489785)

  • Fixed playback of some encrypted video streams on macOS (bug 1491940)

  • Various security fixes



Mozilla Firefox 64.0a1

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Version 64.0a1, first offered to Nightly channel users on September 4, 2018


Firefox Nightly gets updated every day and as a consequence, the release notes for the Nightly channel are updated continuously to reflect features that have reached sufficient maturity to benefit from community feedback and bug reports. Features listed here may or may not make a final release of Firefox.

Mozilla Firefox 63.0 Beta

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Firefox Beta

September 5, 2018

Version 63.0beta, first offered to Beta channel users on September 5, 2018



  • On macOS, WebGL power preferences allow non-performance-critical applications and applets to request the low-power GPU instead of the high-power GPU in multi-GPU systems

  • Improved Windows 10 integration: your Firefox theme now matches your OS Dark / Light mode

  • WebExtensions now run in their own process on Linux

  • Faster tab switching in the majority of cases for our macOS users

  • Improved the reactivity of Firefox on macOS


  • In the Library, the Open in Sidebar feature for individual bookmarks was removed

  • Never check for updates option removed from about:preferences. If a substitute is needed, we recommend using the DisableAppUpdate enterprise policy

  • Firefox now warns about having multiple windows/tabs open when quitting from the main menu.

  • The Ctrl+Tab shortcut now displays thumbnail previews of your tabs and cycles through tabs in recently used order. This new default behavior is activated only in new profiles and can be changed in your preferences

  • The build infrastructure of Firefox on Windows moved to the Clang tool chain, bringing important performance gains

Mozilla Firefox 62.0 Beta 20

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Version 62.0beta, first offered to Beta channel users on June 26, 2018



  • Display preview image and favicon in the New Bookmark dialog

  • Added a Clear Site Data and Cookies button to the identity popup located next to the address bar so as to provide a quick and easy process to delete local data for the visited website

  • Three-pane Inspector in Developer Tools separates the rules into its own panel

  • New tab page sections such as top sites, highlights, and Pocket can be adjusted to include 1 to 4 rows in the Preferences

  • Added Canadian English (en-CA) locale

  • Users who disconnect Firefox for desktop from Sync are now offered the option to wipe their personal data from that device (such as bookmarks, passwords, history, cookies, and site data)

  • Added a button to the hamburger menu to toggle Tracking Protection on and off


  • The description field for bookmarks has been removed. Users who manually changed the field can export old descriptions via html or json. Stored descriptions will be removed in a future release.

  • The release version of Firefox 62 will be sandboxing AutoConfig to the documented API. You can test this in Firefox Beta by setting the preference general.config.sandbox_enabled to true. If you need to continue use more complex AutoConfig scripts, you will need to use Firefox Extended Support Release (ESR).


  • Changes affecting developers

Developer Information

web platform

  • JavaScript library for interactive editing of CSS Shapes values in the browser, with functional values like polygon(), circle() and ellipse()

  • CSS Variable Fonts (OpenType Font Variations) enable a single font file to behave like multiple fonts

Mozilla Firefox 61.0.2

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Firefox Release
August 8, 2018

Version 61.0.2, first offered to Release channel users on August 8, 2018
Adds support for automatically restoring your Firefox session after Windows restarts. Currently, this feature is not enabled by default for most users, but will be gradually enabled over the coming weeks.

Improved website rendering with the Retained Display List feature enabled (Bug 1474402)

Fixed broken DevTools panels with certain extensions installed (Bug 1474379)

Fixed a crash for users with some accessibility tools enabled (Bug 1474007)

Mozilla Firefox 61.0.1

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Firefox Release
July 5, 2018

Version 61.0.1, first offered to Release channel users on July 5, 2018
Fixed broken website loading for Chinese users with accessibility enabled (Bug 1471824)

Fix missing content on the New Tab Page and the Home section of the Preferences page (Bug 1471375)

Fixed loss of bookmarks under rare circumstances when upgrading from Firefox 60 (Bug 1472127)

Improved playback of Twitch 1080p video streams (Bug 1469257)

Web pages no longer lose focus when a browser popup window is opened (Bug 1471415)

Fixed launching of downloads without a file extension on Windows (Bug 1465458)

Re-allowed downloading files from FTP sites via the "Save Link As" option when linked from HTTP pages (Bug 1470295)

Fixed extensions being unable to override the default homepage in certain situations (Bug 1466846)

Mozilla Firefox 61.0

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Firefox Release
June 26, 2018

Version 61.0, first offered to Release channel users on June 26, 2018
Firefox Quantum keeps on keeping on. Look to this release for even more performance improvements, features that let you do more without leaving the webpage you’re on, and a safer online experience.

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

Enhanced performance:

Faster page rendering with Quantum CSS improvements and the new retained display list feature
Faster switching between tabs on Windows and Linux
WebExtensions now run in their own process on MacOS
Convenient access to more search engines: You can now add search engines to the address bar “Search with” tool from the page action menu when on a webpage that provides an OpenSearch plugin

Share links from Firefox for MacOS more easily: You can now share the URL of an active tab from the page actions menu in the address bar

Improved security:

On-by-default support for the latest draft of the TLS 1.3 specification
Access to FTP subresources inside http(s) pages has been blocked
A more consistent user experience: Improvements for dark theme support across the entire Firefox user interface

More customization for tab management: added support to allow WebExtensions to hide tabs

Improved bookmark syncing

Various security fixes

The settings for customizing your homepage and new tab page in Firefox have been added to a new Preferences section that can be accessed from Firefox at about:preferences#home. The settings can also be accessed via the gear icon on the New Tab page.

Users with Avast or AVG security software using the HTTPS Scanning feature may get an error message (SSL_ERROR_RX_RECORD_TOO_LONG) when trying to access secure sites. Workarounds are available from this support article until fixed versions of Avast and AVG are available