Thunderbird Version 91.9.0

[German]The developers of the Thunderbird email client have released Thunderbird 91.9.0 as of May 3, 2022. This is a maintenance update for the 91 development branch. Thanks to Tom for pointing this out.


According to the Thunderbird release notes release notes, a warning is now displayed when an OpenPGP key has unsafe attributes that are ignored; see support article. At the same time, the update to Thunderbird version 91.9.0 brings fixes for the following bugs.  

  • OpenPGP integration in Thunderbird 91.8.0 and 91.8.1 did not allow SHA-1 key signatures
  • macOS disk image graphics updated
  • CalDAV calendars were marked as read-only on startup
  • Task creation box on macOS incorrectly displayed a search icon

Security issues were not fixed according to this Mozilla page.

Sicherheitsprobleme wurden laut dieser Mozilla-Seite keine beseitigt.

System requirements

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

  • Windows: Windows 7 or higher
  • Mac: Mac OS X 10.9 or higher
  • Linux: GTK+ 3.14 or higher

The download of the free Thunderbird is available here.


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