Beta Notes

Thunderbird Desktop

Version 86.0beta | Released January 29, 2021

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.

These notes apply to Thunderbird version 86 beta 3 released February 16, 2021.

System Requirements: Details

  • Windows: Windows 7 or later
  • Mac: macOS 10.12 or later
  • Linux: GTK+ 3.14 or higher
Thunderbird 86.0b1 is using a new implementation of the message sending code that is easier to maintain and more flexible. As with any major change, bugs are bound to happen. The old behavior can be restored by setting the pref "mailnews.send.jsmodule" to false.

What’s New

new

Allow pinning folder views to the Folder Pane

1163555

What’s Changed

changed

Message addressees that are not found in any address book will no longer appear in red type; invalid addresses will appear red

1660691

changed

Reenabled javascript-based message sending code by default

1211292

changed

Folder pane color scheme overhauled with a focus on readability

1682065

changed

Calendar: Imported events are not sorted before being displayed

1683060

What’s Fixed

fixed

Thunderbird did not properly handle Self-signed certificates on IMAP servers

1676141

fixed

Pressing command+enter to send a message on macOS did not work

1682147

fixed

Saving an image from a message body with "Save Image As" did not work

1682873

fixed

Various issues with IMAP folders with non-ASCII names, especially on Gmail

1685033 1685449 1685450 1686034 1686415 1687452 1687727 1687938

fixed

OpenPGP: Failed to save attachments that contained binary data after decryption

1686055

fixed

Various global search fixes

1578302 1686317

fixed

Importing an address book from a CSV file always reported an error

1685048

fixed

Windows uninstaller did not always remove all Thunderbird program files

1678823

fixed

Calendar: HTML entities appeared in event and task descriptions

1663947

fixed

Calendar: FileLink UI fixes for Caldav calendars

1669803

fixed

Calendar: Various dialog updates

1685947

fixed

MailExtension options pages did not always completely load

1641577

Changed and Fixed in Beta 2

What’s Changed

changed

Thunderbird will no longer allow installation of addons that use the legacy API

1688904

What’s Fixed

fixed

Security information for S/MIME messages was not displayed correctly prior to a draft being saved

1683701

fixed

Automatic account setup did not use the provider email and display name

1689079

fixed

Favorite Folder view did not maintain UI state between Thunderbird restarts

1656501

fixed

Compact folder view did not work

1689553

fixed

Searching addons from "Manage Extensions" page was not working

1688887

fixed

Printing address book and calendar were broken in 86 beta 1

1689042 1689461

fixed

Recurring tasks were always marked incomplete; unable to use filters

1686466

fixed

Thunderbird "about:" pages were not able to open links to web pages

1690176

fixed

Various UI widgets not working

1689509 1690098 1690467 1690514

Fixed in Beta 3

What’s Fixed

fixed

Mail filter and junk logs were empty

1690042

fixed

Converting an email to a calendar event or task failed

1690900

fixed

Calendar: Changing the week start day from the default did not persist across restarts

1689775

fixed

Extension manager was missing link to addon support web page

1642219

fixed

Extension manager did not show if an addon used experiment APIs

1689060

fixed

Devtools: Viewing extension sources displayed a blank page

1690826

See All Releases

Learn What’s Next

Thunderbird keeps getting better. Subscribe to our newsletter and follow us on social media to stay informed.

Visit Our Blog