Version 139.0.2 | Released June 10; 2025$$$What’s Fixed$$$fixed$$$Security fixes

Thunderbird Desktop$$$Version 139.0.1 | Released June 2; 2025$$$What’s Fixed$$$Thunderbird could crash when copying a local folder to IMAP$$$Upgrade to 139.0 incorrectly switched Table View to Cards View

Version 139.0 | Released May 27; 2025$$$What’s New$$$new$$$Implemented enterprise policy to allow granular in-app notification control$$$$$$new$$$Added Mark as Read and Delete actions to mail notifications$$$$$$new$$$Implemented customizable row count for Cards View in Appearance settings$$$$$$new$$$Implemented ability to manually sort folders in the folder pane$$$$$$What’s Fixed$$$fixed$$$Thunderbird could crash when setting message compose headers$$$$$$fixed$$$Links in the OAuth authentication window did not open when clicked$$$$$$fixed$$$Access was not allowed to attachments at specific UNC hosts$$$$$$fixed$$$Mail window could stop functioning during and after folder compaction$$$$$$fixed$$$Full folder sorting logic was not used when inserting folders after move$$$$$$fixed$$$mail.compose.other.header headers were not shown in Show All Headers mode$$$$$$fixed$$$Folder was hidden from Favorite when a subfolder was removed$$$$$$fixed$$$Folder tree message counts displayed incorrectly under certain conditions$$$$$$fixed$$$Selection was not restored after manual folder sorting$$$$$$fixed$$$Dragging a folder to a new parent did not insert it correctly for IMAP folders$$$$$$fixed$$$Compact View users had all folders expanded after restart$$$$$$fixed$$$Invite attachments without a name were forwarded as Attached Message Part$$$$$$fixed$$$Chat settings tab remained visible when mail.chat.enabled was false$$$$$$fixed$$$Selected folder was not refreshed when applying Appearance Threading settings$$$$$$fixed$$$Grouped by Sort for all folders in Appearance settings did not work properly$$$$$$fixed$$$Thunderbird could crash if message copying to Sent folder was interrupted$$$$$$fixed$$$System search toggle did not properly reflect and control integration state$$$$$$fixed$$$Dragging attachments to desktop from Thunderbird did not work on macOS$$$$$$fixed$$$Dark mode messages displayed in light mode due to preference setting conflict$$$$$$fixed$$$Cancelling a post to a news server could fail and remove the article$$$$$$fixed$$$Thunderbird could crash in NNTP subscription dialog$$$$$$fixed$$$Newsgroup searches with slashes were not supported with XPAT-enabled servers$$$$$$fixed$$$Offline newsgroup use lacked functionality needed for effective offline access$$$$$$fixed$$$Chat accounts could not be deleted$$$$$$fixed$$$Reminders missed for all-day events when calendar.alarms.showmissed was false$$$$$$fixed$$$Access to multiple CalDAV calendars was not possible$$$$$$fixed$$$Visual and UX improvements$$$$$$fixed$$$Security fixes

Thunderbird Desktop$$$Version 138.0 | Released April 29; 2025$$$$$$What’s New$$$new$$$New mail alert now includes message disposition buttons$$$$$$new$$$New mail notification customization added to macOS Settings$$$$$$What’s Changed$$$changed$$$Changed color override defaults with high contrast mode on macOS and Linux$$$$$$What’s Fixed$$$fixed$$$macOS notifications displayed two logos$$$$$$fixed$$$Message preview truncation in notifications improved$$$$$$fixed$$$Wrong day of week displayed for some emails$$$$$$fixed$$$In dark mode with light theme; message reader still displayed in dark mode$$$$$$fixed$$$Message link and text colors were incorrect when using Dark Reader$$$$$$fixed$$$Unchecking Show all headers in Message Header Settings closed dialog$$$$$$fixed$$$Address book did not match users when case differed in some instances$$$$$$fixed$$$Menu items to manage folders were not disabled in offline mode$$$$$$fixed$$$Using Delete column in Search Messages... window could delete other messages$$$$$$fixed$$$Ctrl or Shift selecting multiple messages reset when dragging across a message$$$$$$fixed$$$Newsgroups could no longer be re-ordered in the folder tree via drag and drop$$$$$$fixed$$$Windows users with non-ASCII folder names and profile paths could not view emails$$$$$$fixed$$$OpenPGP key was not updated when accepted key was reimported with new identities$$$$$$fixed$$$Dual signed (PGP and S/MIME) emails were not displayed$$$$$$fixed$$$Notification duration preference enabled when system notifications were enabled$$$$$$fixed$$$Thunderbird could crash when adaptive message filtering was enabled$$$$$$fixed$$$CardDAV synchronization to Zimbra server failed$$$$$$fixed$$$Keyboard navigation was not possible when first header button was disabled$$$$$$fixed$$$Folders missing from view when Show only subscribed folders was not selected$$$$$$fixed$$$Nickserv messages appeared during successful authentication$$$$$$fixed$$$Global indexing failed when processing email with invalid calendar data$$$$$$fixed$$$Clicking a mid: link in Calendar opened two copies of the message$$$$$$fixed$$$Some calendar requests were blocked due to opaque response blocking$$$$$$fixed$$$Visual and UX improvements$$$$$$fixed$$$Security fixes

Thunderbird Desktop$$$Version 137.0.1 | Released April 4; 2025$$$What’s Fixed$$$fixed$$$Added delay to built-in notifications when new profile is created in offline mode

Not yet updated by vendor.

FIXES$$$FIXED$$$Thunderbird processes did not exit cleanly; user intervention was required via task manager$$$$$$KNOWN ISSUES$$$UNRESOLVED$$$After changing password on an IMAP account; the account could become locked due to too many failed login attempts

FIXES$$$FIXED$$$Opened ignored messages in a message thread/subthread were not marked as read in IMAP folders$$$$$$FIXED$$$Multi-language spellcheck sometimes skipped languages$$$$$$FIXED$$$Thread tree did not update when live language switching$$$$$$FIXED$$$Visual improvements to Reorder Attachments popup$$$$$$FIXED$$$Sort order was sometimes incorrect in Grouped By views$$$$$$FIXED$$$Selecting Match all messages in Filter Rules dialog did not disable all search criteria$$$$$$FIXED$$$S/MIME-only signed messages sometimes incorrectly displayed signature as invalid$$$$$$FIXED$$$OpenPGP keys uploaded to an HKP keyserver were sent with the wrong Content-Type header$$$$$$FIXED$$$Keyboard navigation within search toolbar did not work$$$$$$FIXED$$$Flatpak builds only had the en-US spell check dictionary available$$$$$$FIXED$$$Security fixes

WHAT’S NEW$$$NEW$$$Autocrypt Gossip key distribution added$$$$$$FIXES$$$FIXED$$$When starting Thunderbird; unread message count did not appear on collapsed accounts$$$$$$FIXED$$$Blank window was sometimes displayed when starting Thunderbird$$$$$$FIXED$$$Thunderbird --chrome flag incorrectly opened extra messenger.xhtml$$$$$$FIXED$$$Add-ons did not start correctly when opening Thunderbird from other programs$$$$$$FIXED$$$Drag-and-drop installation of add-ons did not work if Add-ons Manager was opened from Unified Toolbar$$$$$$FIXED$$$Double-clicking empty space in message pane incorrectly opened the currently selected message$$$$$$FIXED$$$Canceling SMTP send before progress reached 100% did not stop message from sending$$$$$$FIXED$$$PDF attachments open in a separate tab did not always restore correctly after restarting Thunderbird$$$$$$FIXED$$$Some OpenPGP dialogs were too small for their contents$$$$$$FIXED$$$Account Manager did not work with hostnames entered as punycode$$$$$$FIXED$$$Downloading complete message from POP3 headers caused message tab/window to close when Close message window/tab on move or delete was enabled$$$$$$FIXED$$$Some ECC GPG keys could not be exported$$$$$$FIXED$$$Contacts deleted from mailing list view still visible in Details view$$$$$$FIXED$$$After selecting contacts in Address Book and starting a new search; the search results list did not update$$$$$$FIXED$$$Various UX and visual improvements$$$$$$FIXED$$$Security fixes

WHAT’S NEW$$$NEW$$$OAuth2 now supported for comcast.net$$$$$$FIXES$$$FIXED$$$High CPU usage sometimes occurred with IMAP CONDSTORE (conditional STORE) enabled$$$$$$FIXED$$$Replying to a collapsed thread via keyboard shortcut (Ctrl+R/Cmd+R) opened a reply for every message in the thread$$$$$$FIXED$$$Enabling Grouped By view after reversing sort order of column header caused messages to be grouped incorrectly$$$$$$FIXED$$$Opening thread pane context menu via keyboard did not always scroll view to selection$$$$$$FIXED$$$New mail indicator for POP3 accounts did not indicate new messages ready to be downloaded$$$$$$FIXED$$$Messages could not be moved to folders using Message > Move To if text or a link in the message had been clicked on first$$$$$$FIXED$$$MIME part boundaries were not properly terminated

FIXED$$$Message selection misbehaved after selecting a sub-message in an expanded thread; collapsing the thread; then pressing up/down to move selection$$$$$$FIXED$$$Thunderbird now attempts to reconnect on a new connection after SMTP 4xx errors$$$$$$FIXED$$$HTML FileLink attachments used the wrong encoding$$$$$$FIXED$$$Security fixes - https://www.mozilla.org/en-US/security/known-vulnerabilities/thunderbird/#thunderbird115.6

FIXES$$$FIXED$$$Initial message was not automatically selected when opened in conversation$$$$$$FIXED$$$Newsgroup users using FQDN identity generated message ID headers with incorrect domain name$$$$$$FIXED$$$Link previews had poor legibility in dark mode$$$$$$FIXED$$$Plasmas task switcher displayed the default icon when running the Thunderbird Flatpak on Wayland$$$$$$FIXED$$$Link to Flatpak manifest was incorrect$$$$$$FIXED$$$Security fixes

FIXES$$$FIXED$$$No messages or calendar items were displayed on startup$$$$$$FIXED$$$Toolbar & Folder View widget fixes$$$$$$FIXED$$$Insert image dialog was not properly sized on some localized builds$$$$$$FIXED$$$The unencrypted subject icon was always briefly displayed when replying to a message$$$$$$FIXED$$$RSS feeds with lengthy attachment filenames cut off visible content$$$$$$FIXED$$$RSS feeds with no favicon displayed default icon in the folder color$$$$$$FIXED$$$NNTP messages that were previously downloaded were not displayed if the server went offline$$$$$$FIXED$$$Vcard photos were not imported when using opening the file with Thunderbird$$$$$$FIXED$$$Publishing calendars to invalid URLs did not display a helpful error$$$$$$FIXED$$$Publishing calendar events via authenticated WebDAV failed$$$$$$FIXED$$$Converting a message to an event failed when the message pane was not displayed$$$$$$FIXED$$$Redirect dialog displayed for WebDAV calendars was too small$$$$$$FIXED$$$Visual and Theme improvement

FIXES$$$FIXED$$$Security fixes

FIXES$$$$$$FIXED$$$Security fixes

Thunderbird 102.15.0; is the final release of Thunderbird 102.$$$$$$FIXES$$$FIXED$$$Old OpenPGP secret keys could not be used to decrypt messages under certain circumstances$$$$$$FIXED$$$Security fixes

WHAT’S NEW$$$NEW$$$Thunderbird MSIX packages are now published on archive.mozilla.org$$$$$$CHANGES$$$CHANGED$$$Size; Unread; and Total columns are now right-aligned$$$$$$CHANGED$$$Newsgroup names in message list header are now abbreviated$$$$$$FIXES$$$FIXED$$$Message compose window did not apply theme colors to menus$$$$$$FIXED$$$Reading the second new message in a folder cleared the unread indicator of all other new messages$$$$$$FIXED$$$Displayed counts of unread or flagged messages could become out-of-sync$$$$$$FIXED$$$Deleting a message from the context menu with messages sorted in chronological order and smooth scroll enabled caused message list to scroll to top$$$$$$FIXED$$$Repeatedly switching accounts in Subscribe dialog caused tree view to stop updating$$$$$$FIXED$$$Ignore thread caused message cards to display incorrectly in message list$$$$$$FIXED$$$Creating tags from unified toolbar failed$$$$$$FIXED$$$Cross-folder navigation using F and N did not work$$$$$$FIXED$$$Account Manager did not resize to fit content; causing Close button to become hidden outside bounds of dialog when too many accounts were listed$$$$$$FIXED$$$Remote content exceptions could not be added in Settings$$$$$$FIXED$$$Newsgroup list file did not get updated after adding a new NNTP server$$$$$$FIXED$$$Download all headers option in NNTP Download Headers dialog was incorrectly selected by default$$$$$$FIXED$$$Convert to event/task was missing from mail context menu$$$$$$FIXED$$$Events and tasks were not shown in some cases despite being present on remote server$$$$$$FIXED$$$Various visual and UX improvements$$$$$$FIXED$$$Security fixes

FIXES$$$FIXED$$$Some HTML emails printed headers on first page and message on subsequent pages$$$$$$FIXED$$$Deleting messages from message list sometimes scrolled list to bottom; selecting bottommost message$$$$$$FIXED$$$Width of icon columns (like Junk or Starred) in message list did not adjust when UI density was changed$$$$$$FIXED$$$Old OpenPGP secret keys could not be used to decrypt messages under certain circumstances$$$$$$FIXED$$$When multiple folder modes were active; tab focus navigated through all folder mode options before reaching message list$$$$$$FIXED$$$Unread message count badge was not displayed on parent folders of subfolder containing unread messages$$$$$$FIXED$$$Undo archive (via Ctrl-Z) did not un-archive previously archived messages$$$$$$FIXED$$$New button dropdown menu in Message Filters dialog could not be opened via keyboard navigation$$$$$$FIXED$$$Show New Mail Alert for input field in Customize New Mail Alert dialog had zero width when using certain language packs$$$$$$FIXED$$$Account Wizard dialog was too narrow when adding a news server; partially hiding confirmation buttons$$$$$$FIXED$$$Link Properties and Image Properties dialogs in the composer were too wide$$$$$$FIXED$$$Thunderbird version number and details in About dialog were not automatically read by screen readers when first opening dialog$$$$$$FIXED$$$Flatpak improvements and bug fixes$$$$$$FIXED$$$Various visual and UX improvements

FIXES$$$FIXED$$$Searching the directory for recipients certificates popup could block compose window when S/MIME reminder was enabled and using an LDAP address book$$$$$$FIXED$$$Some elements still used animations with prefers-reduced-motion set$$$$$$FIXED$$$Visual and theme improvements$$$$$$FIXED$$$Security fixes

FIXED$$$During Account Setup; the Checking password... message was not removed after a failure$$$$$$FIXED$$$Miscellaneous UI fixes$$$$$$FIXED$$$Security fixes

FIXES$$$FIXED$$$Messages with missing or corrupt From: header did not display message header buttons$$$$$$FIXED$$$Composer repeatedly prompted for S/MIME smartcard signing/encryption password$$$$$$FIXED$$$Address Book integration did not work with macOS 11.4 Bug Sur$$$$$$FIXED$$$Mexico City DST fix in Thunderbird 102.10.0 (bug 1826146) was incomplete

FIXED$$$Thunderbird was unable to open file URLs from command line (URLs beginning with file://)$$$$$$FIXED$$$Source strings for localized builds not uploaded to FTP as expected$$$$$$FIXED$$$Visual and theme improvements$$$$$$FIXED$$$Security fixes

FIXES$$$FIXED$$$Notification about a senders changed OpenPGP key was not immediately visible$$$$$$FIXED$$$TLS Certificate Override dialog did not appear when retrieving messages via IMAP using Get Messages context menu$$$$$$FIXED$$$Spellcheck dictionaries were missing from localized Thunderbird builds that should have included them$$$$$$FIXED$$$Tooltips for Show/Hide calendar toggle did not display$$$$$$FIXED$$$Various security fixes

$$$WHAT’S NEW$$$NEW$$$The Troubleshooting Information page now displays version of the OpenPGP backend library used by Thunderbird.$$$$$$NEW$$$Added option to build RNP library with OpenSSL backend (use --with-librnp-backend=openssl configure option)$$$$$$FIXES$$$FIXED$$$Get Messages did not retrieve messages from Gmail accounts using a local folder as a deferred inbox$$$$$$FIXED$$$Various visual and UX improvements$$$$$$FIXED$$$Various security fixes$$$$$$KNOWN ISSUES$$$UNRESOLVED$$$Source strings for localized builds not uploaded to FTP as expected

FIXES$$$FIXED$$$Remote content did not load in user-defined signatures$$$$$$FIXED$$$Addons that added new action buttons were not shown for addon upgrades; requiring removal and reinstall$$$$$$FIXED$$$Various stability improvements$$$$$$FIXED$$$Security fix

FIXES$$$FIXED$$$Importing secret OpenPGP keys failed when public key with public subkey was already present$$$$$$FIXED$$$Message index files were incorrectly deleted when too many folders were opened$$$$$$FIXED$$$Thunderbird sometimes incorrectly formatted synced vCards$$$$$$FIXED$$$Recurring events did not display past a certain number of repetitions$$$$$$FIXED$$$Cookies deleted from the Show Cookies dialog were not actually deleted$$$$$$FIXED$$$Paused RSS feeds did not actually pause updates$$$$$$FIXED$$$Various visual and UX improvements$$$$$$FIXED$$$Various security fixes

FIXED$$$Copy to again menu item was not present after copying message to folder with Unicode name on Unicode-enabled IMAP server$$$$$$FIXED$$$Calendar date picker was displayed behind Send Later window$$$$$$FIXED$$$Various security fixes

For details refer: https://www.thunderbird.net/en-US/thunderbird/102.4.1/releasenotes/

For details refer: https://www.thunderbird.net/en-US/thunderbird/102.3.1/releasenotes/

For details refer: https://www.thunderbird.net/en-US/thunderbird/102.1.2/releasenotes/