Release Notes

Thunderbird Desktop

Version 91.5.1 | Released January 24, 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 Fixed


JS LDAP implementation did not support self-signed SSL certificates


After saving a draft and subsequently sending a FileLink email, the original file was removed from disk


Chat OTR encryption did not work


OTR verification bar was not removed after completing verification


Various theme improvements

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