Release Notes

Thunderbird Desktop

Version 115.5.2 | Released December 11, 2023

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 help and a quick start on Thunderbird 115, see Thunderbird 115 Supernova FAQ.

For more on all the new features in Thunderbird 115, see What’s New in Thunderbird 115.

System Requirements: Details

  • Windows: Windows 7 or later
  • Mac: macOS 10.12 or later
  • Linux: GTK+ 3.14 or higher

What’s Fixed

fixed

"Compact" option was missing from folder context menu for IMAP accounts using maildir

fixed

Message list could not be properly read by screen readers in table view

fixed

Messages with slow-loading images were delayed being marked as read

fixed

Messages opened in background tab were incorrectly marked as read

fixed

Mark All Read did not work for virtual folders

fixed

Delete (trash icon) in message display did not work in Unified folders

fixed

Unified folders were missing "Mark Folder Read" option in context menu

fixed

"Reply to List" was incorrectly disabled in Unified Toolbar since Thunderbird 115.4.1

fixed

Sorting by column with "Grouped By" enabled then performing a quick filter search caused blank message pane

fixed

Attachment list did not always appear if remote message content loaded slowly

fixed

Messages in outbox were not shown as unread by default

fixed

"Apply columns to" sometimes failed to apply columns to a root folder and its descendants

fixed

Global search results displayed as a list did not allow threads to be collapsed

fixed

"Quick Filter" button on toolbar was disabled when viewing search results as a list

fixed

Folder open hover delay was too short when using drag-and-drop

fixed

Parent folders with collapsed subfolders did not consistently display new mail indicator or message count for subfolders

fixed

Message list scroll position could move randomly when switching folders

fixed

Undoing deletion of local messages required using "Undo" (Ctrl-Z) twice

fixed

IMAP messages deleted in Thunderbird still appeared in other email clients that don't respect messages marked "\deleted"

fixed

IMAP folder discovery was slowed by status bar message updates

fixed

Servers with non-LDH (letters-digits-hyphens) hostnames, such as those containing non-ASCII Unicode characters, could not be found

fixed

Images could not be copied and pasted from one message into another

fixed

Troubleshooting page (about:support) did not work on profiles with no outgoing email server, such as news-only profiles

fixed

Minimize/maximize button order was incorrect when placing window titlebar buttons on left-hand side

fixed

OpenPGP integraton with smartcard using latest version of Gpg4Win failed

fixed

Various accessibility improvements

fixed

Various UX and visual improvements

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