Thunderbird 78 is our newest ESR (extended-support release), which comes out yearly and is considered the latest stable release. Right now you can download the newest version from our website, and existing users will be automatically updated in the near Continue reading. July 7, 2020 COMMENTS 62 Thunderbird’s New Home.

What’s New

  • NEW
    Support for new scrollbar style in Mac OS X 10.7 and newer
  • NEW
    Implemented Close tabs to the right
  • NEW
    Social: Ability to tear-off chat windows to view separately by simply dragging them out
  • CHANGED
    Accessibility related improvements on using pinned tabs (see 577727)
  • CHANGED
    Removed support for Revocation Lists feature (see 867465)
  • CHANGED
    Performance improvements on New Tab Page loads (see 791670)
  • DEVELOPER
    Major SVG rendering improvements around Image tiling and scaling (see 600207 )
  • DEVELOPER
    Improved and unified Browser console for enhanced debugging experience, replacing existing Error console
  • DEVELOPER
    Removed support for sherlock files that are loaded from application or profile directory
  • FIXED
    Replace fixed-ratio audio resampler in webrtc.org capture code with Speex resampler and eliminate pseudo-44000Hz rate ( see 886886)
  • FIXED
    24.0: Security fixes can be found here

Known Issues

  • Unresolved
    Firefox 24.0 crashes with the Norton Toolbar. More information. (Also see 917792)
  • Unresolved
    If you try to start Firefox using a locked profile, it will crash (see 573369)
Warning: Firefox now includes downgrade protection to prevent corruption of user profile data. If you install an older version, you'll be prompted to create a new Firefox profile.

If there is a problem with a Firefox, most people will try to revert Firefox back to the way it was before and downgrade it, but we do not recommend this action. Downgrading Firefox leaves a user more vulnerable to attacks and, on most occasions, doesn't fix the problem that occurred while updating. This article gives you some alternatives to downgrading and links to old versions of Firefox, if you do choose to downgrade.

Table of Contents

Problems with an update are generally not caused by the new version of Firefox, but rather the update process. Installing a previous version will not help in most cases. Instead, see:

Note: Other problems can be solved with the Refresh Firefox feature. It restores Firefox to its default state while saving your essential information.

Ensure all security and security related software is fully updated. Some security software will need to be upgraded to a new version for each Firefox version update.

Mozilla Firefox Download And Install

Optional software bundled with security software may also need updating. Such software may not be essential for your security, but if outdated, it may interfere with the use of Firefox, or cause Firefox to crash.

If you want to downgrade, you can visit Mozilla's directory of older Firefox versions using the link below. Please note, however, that using older versions of Firefox can be harmful and that we recommend you use the newest version of Firefox.
Warning: Old Firefox versions pose a significant security risk.
  • Firefox 67.0.432-bit (US English)
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  • Firefox 78.0.232-bit (US English)
  • Firefox 78.0.264-bit (US English)
Download Mozilla Firefox 24 Mac
  • Firefox 79.032-bit (US English)
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  • Firefox 79.032-bit (US English)
  • Firefox 79.064-bit (US English)
  • Firefox 80.0.132-bit (US English)
  • Firefox 80.0.164-bit (US English)
  • Firefox 80.0.132-bit (US English)
  • Firefox 80.0.164-bit (US English)
Important: By default, Firefox is set for automatic updates. To prevent Firefox from automatically updating itself after you install an older version, you'll need to change your Firefox update settings: Click the menu button and select .. In the General panel, go to the Firefox Updates section.

Instead of downgrading to an older, insecure version of Firefox and changing your update settings, you should consider these alternatives:

Download Mozilla Firefox 24 Mac Driver

Install Firefox Extended Support Release.Firefox Extended Support Release (ESR) is an official version of Firefox developed for large organizations like universities and businesses. Firefox ESR does not come with the latest features but it has the latest security and stability fixes. For more information, see the article Switch to Firefox Extended Support Release (ESR) for personal use.

Download Mozilla Firefox 24 Mac

Use the latest version of another browser. If the current Firefox version is not to your liking or just not working right now, there are alternative browsers that you can use to browse the web.

Download Mozilla Firefox 24 Mac Os

If the latest version of Firefox is causing problems for you or you just don't like something about it, please give us feedback about it here:

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