Thunderbird 78.4.1 released with one new feature and several fixes

Mozilla Thunderbird Icon

The team behind the Thunderbird email app has released version 78.4.1. This is a maintenance release with a number of important fixes. Also, there is a new minor feature that changes how Thunderbird works with an Address book entry with multiply email addresses.

Thunderbird is my preferred email client of choice. I use this app on every PC and on every operating system I use. It is stable, contains all the features you need, supports add-ons and also comes with a useful RSS reader. I am using Thunderbird for many years and never felt the need to look for an alternative.

Thunderbird 78 doesn't support classic XUL add-ons any more, but includes some of their features natively. E.g. on Windows you can minimize the app to the system tray.

The following changes have been made in versions 78.4.1

What's in Thunderbird 78.4.1

New features

  • Thunderbird prompts for an address to use when starting an email from an address book entry with multiple addresses


  • Searching global search results did not work
  • Link location was not focused by default when adding a hyperlink in message composer
  • Advanced address book search dialog was unusable
  • Encrypted draft reply emails lost "Re:" prefix
  • Replying to a newsgroup message did not open the compose window
  • Unable to delete multiple newsgroup messages
  • Appmenu displayed visual glitches
  • Visual glitches when selecting multiple messages in the message pane and using Ctrl+click
  • Switching between dark and light mode could lead to unreadable text on macOS

There is also a known issue in this release.

Known issues

  • Message list is not focused at startup

Download Thunderbird

Download Thunderbird

The release notes are available here.

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Author: Sergey Tkachenko

Sergey Tkachenko is a software developer who started Winaero back in 2011. On this blog, Sergey is writing about everything connected to Microsoft, Windows and popular software. Follow him on Telegram, Twitter, and YouTube.

One thought on “Thunderbird 78.4.1 released with one new feature and several fixes”

  1. Froze mine at 68 because none of my calenders will stay visible.

    I’ve included instructions to disable updates in this post.

    You can go here “” and download whatever version you want.

    On 78, every single time I start TB I have to hide and unhide every calender to make it visible again. All the data is there, they sync fine, they just won’t show.

    PS RSS is still not working for this website.

    To disable updates in Thunderbird…

    Exit Thunderbird.

    Type ‘Run’ in search and select ‘Run’ app
    In ‘Run’ app type regedit and click on Ok
    Create new subkey called ‘Mozilla’
    Then create new subkey called ‘Thunderbird’
    On the right, create a new 32-Bit DWORD value DisableAppUpdate.
    Note: Even if you are running 64-bit Windows you must still create a 32-bit DWORD value.
    Set its value to 1.
    Start Thunderbird

    Menu icon > Options > Options > Advanced > ‘Updates’ tab Thunderbird updates – It will state current version number. Options are removed and replaced by: ‘Updates disabled by your system administrator’

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