Release Notes

Thunderbird Desktop

Version 91.9.0 | Released May 3, 2022

Check out the notes below for this version of Thunderbird. As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla.

For more on all the new features in Thunderbird 91, see New in Thunderbird 91.0.

System Requirements: Details

  • Windows: Windows 7 or later
  • Mac: macOS 10.12 or later
  • Linux: GTK+ 3.14 or higher

What’s Changed


A warning is now displayed if an OpenPGP key has unsafe attributes that are ignored; See support article.

What’s Fixed


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 read-only on startup


Task creation field on macOS incorrectly displayed a search icon


Various security fixes

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