Beta Notes

Thunderbird Desktop

Version 88.0beta | Released March 26, 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 88 beta 3 released April 14, 2021.

System Requirements: Details

  • Windows: Windows 7 or later
  • Mac: macOS 10.12 or later
  • Linux: GTK+ 3.14 or higher
Thunderbird 88.0beta 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 preferences "mailnews.send.jsmodule" and "mailnews.smtp.jsmodule" to false.

What’s New

new

Chat: Additional commands and events handled in Matrix

1346441 1347542

new

Chat: Support Matrix servers that require Single Sign-on

1626182

new

Chat: Send presence to Matrix servers

1699060

new

Calendar: Filter and sort items to be imported in the Import dialog

1683063 1686382

What’s Changed

changed

Mail: Adding an attachment no longer produces an animation when the operating system settings indicate that less motion is desired or preference ui.prefersReducedMotion is set to 1.

1695790

What’s Fixed

fixed

The default application confirmation dialog was displayed after each startup on Windows 10, even if Thunderbird is the default when "always check at startup" enabled

1696218

fixed

Mail: Subject column in message lists sometimes showed text from invalid email headers

1615064

fixed

Mail: Right clicking on a folder mode header made the folder tree unresponsive

1692764

fixed

Mail: When creating or renaming an IMAP folder, it was duplicated in the folder tree if multiple folder modes were selected

1696965

fixed

Mail: Could not open PDF attachments when "Open messages in new window" preference set

1663427

fixed

Mail: UI did not update properly after setting up a new email account

1689724

fixed

Mail: Print dialog would take a long time to appear if remote content in message loaded slowly

1694796

fixed

Mail: New message notifications sent to the OS were sometimes excessively large

1697882

fixed

Mail: There were multiple problems with the behavior of editing recipient address pills

1694502 1696692 1696789 1698461

fixed

Mail: Dragging an email into a compose window to attach it was broken

1695641

fixed

Mail: Spellcheck was mistakenly re-enabled when saving message as draft

1695923

fixed

Mail: On Mac, Cmd+Shift+Enter with focus on an address input would send immediately instead of the intended send later

1696790

fixed

Mail: Close tab button did not work when single-clicked with mail.tabs.closeButtons set to 3

1679587

fixed

Mail: Message summary pane had usability issues when multiple messages were selected

1689934

fixed

Mail: Keyboard shortcut to open the Message Security popup did not work on Mac

1692263

fixed

Address Book: Linux shortcut for Advanced Address Book Search (Ctrl+Shift+F) did not work

1686428

fixed

Address Book: Import Address Book from CSV did not not allow mapping all available fields

194095

fixed

Address Book: Radio buttons could not be selected on photo tab of an address card

1671637

fixed

Chat: Double clicking an account type in new account wizard did not select it

1696901

fixed

Chat: Matrix chat messages were not always associated with their participants correctly

1698622

fixed

Chat: /msg command in Matrix did not actually send the message

1699064

fixed

Calendar: There was a potential dataloss issue related to event reminders

1671051

fixed

Calendar: Could not reload .ics calendars unless calendars of other types also existed

1658216

fixed

Calendar: Import and export via CSV did not parse years correctly in event dates

1695584

fixed

Mail Extensions: messages.getRaw() did not work for NNTP/news messages

1696884

fixed

Mail Extensions: contacts.quickSearch() was failing on mailing lists

1695297

fixed

Mail Extensions: menus.onClicked() did not keep the user input status so browserAction.openPopup() could not be used

1681131

Fixed in Beta 2

What’s Fixed

fixed

Preferences page on Windows did not have a setting for displaying an icon in the system tray

1700440

fixed

Delivery Status Notifications did not work in Thunderbird 88.0beta 1

1701450

fixed

Various issues with drag & dropped attachments

1676094 1699051 1701450

fixed

Calendar: Invites from Microsoft Teams did not display the meeting URL

1666296

fixed

Various UX and theme improvements

1700128 1700764 1701525

New & Fixed in Beta 3

What’s New

new

Calendar: webcal:// URL handler now registered on Windows

1237571

What’s Fixed

fixed

Some users could not send messages using new SMTP and MIME implementations

1701741 1701804 1701864

fixed

Hyperlinks in composed messages were duplicated after converting to plain text

1692771

fixed

Usability improvements to various dialogs on Windows

1702433

fixed

Clicking a notification dialog did not open a Thunderbird window when minimize-to-tray was active

1702741

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