Release Notes

Thunderbird Desktop

Version 78.6.1 | Released January 11, 2021

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

For more on all of the new features in Thunderbird 78, see New in Thunderbird 78.0.

System Requirements: Details

  • Windows: Windows 7 or later
  • Mac: macOS 10.9 or later
  • Linux: GTK+ 3.14 or higher

What’s Changed

changed

MailExtensions: browserAction, composeAction, and messageDisplayAction toolbar buttons now support label and default_label properties

What’s Fixed

fixed

Running a quicksearch that returned no results did not offer to re-run as a global search

fixed

Message search toolbar fixes

fixed

Very long subject lines distorted the message compose and display windows, making them unusable

fixed

Compose window: Recipient addresses that had not yet been autocompleted were lost when clicking Send button

fixed

Compose window: New message is no longer marked as "changed" just from tabbing out of the recipient field without editing anything

fixed

Account autodiscover fixes when using MS Exchange servers

fixed

LDAP address book stability fix

fixed

Messages with invalid vcard attachments were not marked as read when viewed in the preview window

fixed

Chat: Could not add TLS certificate exceptions for XMPP connections

fixed

Calendar: System timezone was not always properly detected

fixed

Calendar: Descriptions were sometimes blank when editing a single occurrence of a repeating event

fixed

Various printing bugfixes

fixed

Visual consistency and theme improvements

fixed

Various security fixes

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