Beta Notes

Thunderbird Desktop

Version 89.0beta | Released April 21, 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.

These notes apply to Thunderbird version 89 beta 4 released May 8, 2021.

System Requirements: Details

  • Windows: Windows 7 or later
  • Mac: macOS 10.12 or later
  • Linux: GTK+ 3.14 or higher
Thunderbird 89.0 beta 4 fixes two OpenPGP security vulnerabilities. Details are included in the security advisory for Thunderbird 78.10.2.


Thunderbird developers are working to minimize the impact of the newly inherited Proton UI on Thunderbird. If necessary, Proton can be disabled by setting "browser.proton.enabled" to "false". Please submit a bug report describing the problem.

What’s New

new

Access to Outlook Contacts; To enable, set ldap_2.servers.outlook.dirType to 3; This setting may cause startup delays.

1697669

What’s Changed

changed

Renamed "Add-ons" to "Add-ons and Themes" and "Options" to "Preferences"

1702731

changed

Chat modules and custom widgets are now lazy-loaded to improve Thunderbird startup time

1700013 1700014

What’s Fixed

fixed

Links in PDF attachments did not open in a web browser

1698723

fixed

Printing to a PDF file failed

1701172

fixed

New message notifications displayed messages that were older than the newly received message

1675415

fixed

Sending messages with attachments sometimes failed

1699057

fixed

When removing a mail folder, Thunderbird did not correctly warn about all affected filters

1701259

fixed

Various improvements to recipient pills in message compose window

632127 1659332 1700273 1701313

fixed

Message preview "tooltips" did not appear when hovering over a message in the message list

1688424

fixed

On Windows, it was possible for the taskbar icon and the tray icon to both disappear under some circumstances

1701891

fixed

Removing an address book while viewing "All address books" did not remove its contents from the view

1702090

fixed

Bundled OTR library did not work on macOS

1700349

fixed

Chat: OAuth window was too small to be usable

1697859

fixed

Event boxes were not always focused when clicked

1700024

fixed

Dragging and dropping an ICS file to the Today Pane did not populate the "New Event" dialog

1683460

fixed

Calendar notifications were not displayed in order

1691885

fixed

Event dialog layout refreshed

1705250

fixed

Dark Theme fixes and improvements

1701281 1701740 1703366

fixed

System theme on Linux did not always use native scrollbars

1705460

Fixed in Beta 2

What’s Fixed

fixed

Selected OpenPGP key was lost after opening the Key Properties dialog in Account Settings

1701356

fixed

"Outgoing (SMTP) Server" password dialog did not have an option to remember the password

1706191

fixed

Thunderbird sent invalid IPv6 literals in SMTP HELO, resulting in unsent messages

1707543

fixed

Account Setup did not always complete successfully when opened from Account Settings page

1705272

fixed

User nickname colors were not used in chat content

1706740

fixed

Chat: Multiple system messages did not collapse

1659118

fixed

Various fixes related to introduction of Proton UI upstream

1706895 1706978 1707273

New and Fixed in Beta 3

What’s New

new

Added support for importing OpenPGP keys without a primary secret key

1654893

What’s Fixed

fixed

Unable to create folder names containing ampersand (&) characters on some IMAP servers

1705765

fixed

Quoted plain text messages wrapped incorrectly when using format=flowed and quoted-printable

1702197

fixed

Sending messages with BCC'd recipients failed if the message contained non-UTF-8 attachments

1707178

fixed

SMTP with NTLM authentication did not work

1708710

fixed

Parsing some OpenPGP user IDs failed

1704435

fixed

Various improvements to OpenPGP partial encryption reminders

1701908 1701924 1702582

fixed

New mail notification sound was not played if new mail arrived without reading previously recevied messages

1706890

fixed

Troubleshooting information page did not display row labels on macOS

1709261

fixed

Various fixes related to introduction of Proton UI upstream

1707187 1708618

Fixed in Beta 4

What’s Fixed

fixed

Unable to send messages when the SMTP server password contained non-ASCII characters

1707062

fixed

Draft messages with attachments could not be saved if the message was closed and opened for editing a second time

1710220

fixed

Sending replies sometimes failed if message had BCC'd recipients

1709412

fixed

Some temporary files created by the message composer were not automatically removed after closing the compose window

1710323

fixed

Contacts moved between CardDAV address books were not synced to the new server

1695592

fixed

Google Contacts via CardDAV stopped synchronizing after an hour

1709492

fixed

Participant names in an XMPP multi-user conference were displayed incorrectly if the display name contained UTF-8 characters

1708695

fixed

Calendar: Reduced flickering effect in Today Pane

1708596

fixed

Calendar: The time of day indicator line did not update automatically

1665374

fixed

Mail toolbar buttons were too big when displaying both icons and text

1691297

fixed

Various fixes related to introduction of Proton UI upstream

1703988 1710214

fixed

OpenPGP security fixes

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