Thunderbird 78.9.0

[German]The developers of the Thunderbird email client have released Thunderbird 78.9.0 on March 23, 2021. This is a maintenance update for the 78 main version of the email client, which fixes various bugs and five vulnerabilities.


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According to the release notes, there are no new features, but in addition to fixed vulnerabilities, there are the following bug fixes:

  • New mail notification displayed old messages that were unread
  • Spaces following soft line breaks in messages using quoted-printable and format=flowed were incorrectly encoded; existing messages which were previously incorrectly encoded may now display with some words not separated by a space
  • Some fields were unreadable in the Dark theme in the General preferences panel
  • Sending a message containing an anchor tag with an invalid data URI failed
  • When switching tabs, input focus was not moved to the new tab
  • Address Book: Syncing a read-only Google address book via CardDAV failed
  • Address Book: Importing VCards with non-ascii characters would fail
  • Address Book: Some values may not have been parsed when syncing from Google address books.
  • Add-ons Manager did not show if an addon used experiment APIs
  • Calendar: Removing a recurring task was not possible
System requirements

The system requirements for the different operating system versions (see also form more details):

  • Windows: Windows 7, Windows Server 2008 R2 or higher
  • Mac: Mac OS X 10.9 or higher
  • Linux: GTK+ 3.4 or higher

Thunderbird is free of charge and may be downloaded here.


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