Thunderbird 78.10.2

[German]The developers of the Thunderbird email client have released Thunderbird 78.10.2 on May 17, 2021. It is a maintenance update for the 78 major version of the email client that fixes several bugs and vulnerabilities.


Thanks to Gerold for the tip. According to the release notes, the following new features (among others in the area of OpenPGP key import) have been implemented in the email client in this version: 

  • Added support for importing OpenPGP keys without a primary secret key
  • Add-ons manager displays a preferences icon for mail extensions that include an options page

The list of fixes in this update is also much larger than in 78.10.1. OpenPGP proves to be a constant work in progress, but some quirks have been fixed. Here are the fixes:

  • OpenPGP messages with a high compression ratio (over 10x) could not be decrypted
  • Selected OpenPGP key was lost after opening the Key Properties dialog in Account Settings
  • Parsing some OpenPGP user IDs failed
  • Various improvements to OpenPGP partial encryption reminders
  • Troubleshooting information page did not display row labels on macOS
  • Mail toolbar buttons were too big when displaying both icons and text

In addition, two vulnerabilities are fixed that are rated low. 

  • CVE-2021-29957: Partial protection of inline OpenPGP message not indicated
  • CVE-2021-29956: Thunderbird stored OpenPGP secret keys without master password protection

Concerns both times the security of OpenPGP messages and keys.

System requirements

The system requirements for the different operating system versions (see here for 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

By the way, Thunderbird is free, and the download is available here.

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