Software Update: Mozilla Thunderbird 78.8.1

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The Mozilla Foundation has released version 78.8.1 of Thunderbird. Thunderbird is an open source client for email and newsgroups, with features such as support for several mail and news accounts, a spam filter, spell checker, and a customizable appearance. In version 78, a dark mode has been added and other parts of the interface, such as the icons and the screen for composing an email, have also been overhauled. Furthermore, the Lightning calendar add-on is now a standard part of the program, there is a new wizard for the first use and only MailExtensions add-ons are supported. The changelog for this release looks like this:


  • New mail notification did not occur for newly arrived messages if previously received mail was unread
  • Directory for saving multiple attachments was not remembered between saves
  • Opening a message from the command-line using “-mail ” failed
  • Automatic account setup did not use the provider email and display name
  • Newly-added identities were not listed in the account manager until it was closed and reopened
  • Account provisioner did not properly handle UTF-8 data
  • Copying a large message to an IMAP server would sometimes prematurely display a time-out error
  • OpenPGP: Various errors when importing keys
  • OpenPGP: Public keys attached to an outgoing email did not have “Content-Description” set
  • Address Book: CardDAV sync errors did not retry until Thunderbird was restarted
  • Calendar: Changing the cache mode of a CalDAV calendar connection would lose the username of the account
  • Calendar: Add-on calendars were sometimes not visible after restarting
  • Calendar: The preview for a recurring task did not use all available space in the dialog window
  • Installer: Option to keep distribution directory on upgrade did not work

Version number 78.8.1
Release status Final
Operating systems Windows 7, Linux, macOS, Windows 8, Windows 10
Website Mozilla Foundation
License type Freeware
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