Mozilla Thunderbird ESR en-US x86 Version 153.3.1
Thunderbird Desktop$$$Version 153.3.1esr | Released September 18; 2026$$$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.$$$$$$For help and a quick start on Thunderbird 153; see Thunderbird 153 Meadow FAQ$$$$$$For more on all the new features in Thunderbird 153; see What’s New in Thunderbird 153.$$$$$$System Requirements: Details$$$$$$What’s Changed$$$changed$$$There are no Thunderbird changes requiring release notes in this release
Mozilla Thunderbird ESR en-US x86 Version 140.15.0
Thunderbird Desktop$$$Version 140.15.0esr | Released September 1; 2026$$$Check out the notes below for this version of Thunderbird. As always; you’re encouraged to tell us what you think; ask for help; or file a bug in Bugzilla.$$$$$$For help and a quick start on Thunderbird 140; see Thunderbird 140 Eclipse FAQ$$$$$$For more on all the new features in Thunderbird 140; see What’s New in Thunderbird 140.$$$$$$System Requirements: Details$$$$$$Windows: Windows 10 or later$$$Mac: macOS 10.15 or later$$$Linux: GTK+ 3.14 or higher$$$What’s Fixed$$$fixed$$$Windows jump list menu no longer functioned correctly$$$$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 153.2.0
Thunderbird Desktop$$$Version 153.2.0esr | Released September 1; 2026$$$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.$$$$$$For help and a quick start on Thunderbird 153; see Thunderbird 153 Meadow FAQ$$$$$$For more on all the new features in Thunderbird 153; see What’s New in Thunderbird 153.$$$$$$System Requirements: Details$$$$$$Windows: Windows 10 or later$$$Mac: macOS 10.15 or later$$$Linux: GTK+ 3.14 or higher$$$What’s Fixed$$$fixed$$$Deleting an Exchange account retained the outgoing server settings$$$$$$fixed$$$Thunderbird upgrade disabled Settings menu for versions before macOS 13$$$$$$fixed$$$Windows jump list menu no longer functioned correctly$$$$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.15.0
Thunderbird Desktop$$$Version 140.15.0esr | Released September 1; 2026$$$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.$$$$$$For help and a quick start on Thunderbird 140; see Thunderbird 140 Eclipse FAQ$$$$$$For more on all the new features in Thunderbird 140; see What’s New in Thunderbird 140.$$$$$$System Requirements: Details$$$$$$Windows: Windows 10 or later$$$Mac: macOS 10.15 or later$$$Linux: GTK+ 3.14 or higher$$$What’s Fixed$$$fixed$$$Windows jump list menu no longer functioned correctly$$$$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 153.2.0
Thunderbird Desktop$$$Version 153.2.0esr | Released September 1; 2026$$$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.$$$$$$For help and a quick start on Thunderbird 153; see Thunderbird 153 Meadow FAQ$$$$$$For more on all the new features in Thunderbird 153; see What’s New in Thunderbird 153.$$$$$$System Requirements: Details$$$$$$Windows: Windows 10 or later$$$Mac: macOS 10.15 or later$$$Linux: GTK+ 3.14 or higher$$$What’s Fixed$$$fixed$$$Deleting an Exchange account retained the outgoing server settings$$$$$$fixed$$$Thunderbird upgrade disabled Settings menu for versions before macOS 13$$$$$$fixed$$$Windows jump list menu no longer functioned correctly$$$$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.15.0
Thunderbird Desktop$$$Version 140.15.0esr | Released September 1; 2026$$$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.$$$$$$For help and a quick start on Thunderbird 140; see Thunderbird 140 Eclipse FAQ$$$$$$For more on all the new features in Thunderbird 140; see What’s New in Thunderbird 140.$$$$$$System Requirements: Details$$$$$$Windows: Windows 10 or later$$$Mac: macOS 10.15 or later$$$Linux: GTK+ 3.14 or higher$$$What’s Fixed$$$fixed$$$Windows jump list menu no longer functioned correctly$$$$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 153.0.1
What’s Changed$$$changed$$$There are no Thunderbird changes requiring release notes in this release$$$$$$See All Releases
Mozilla Thunderbird ESR en-US x86 Version 140.13.0
What’s Fixed$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 153.0
What’s New$$$new$$$Visual signatures can be added to PDF attachments opened in Thunderbird$$$$$$new$$$Copy Message Link and Copy News Link added to header pane More actions$$$$$$new$$$Accessiblity is improved in various tree views$$$$$$new$$$Added Archive action to mail notifications$$$$$$new$$$Add Show Full Path folder pane option for compact view modes$$$$$$new$$$Unified folders now display account color indicator with account name tooltip$$$$$$new$$$Folder copy enabled within mail server accounts and local folders$$$$$$new$$$Reset Folder Order option added to folder pane to reset custom folder sorting$$$$$$new$$$Add `mail.useLocalizedFolderNames to toggle special folder name localization$$$$$$new$$$Favorites added as destination for Move To and File buttons$$$$$$new$$$Composer now shows a warning if users configured OpenPGP key expires soon$$$$$$new$$$Enabled configuration of preferred OpenPGP keyserver via the UI$$$$$$new$$$Add mail.openpgp.load_untested_gpgme_version to load untested GPGME version
Mozilla Thunderbird ESR en-US x86 Version 140.12.1
Thunderbird Desktop$$$Version 140.12.1esr | Released June 30; 2026$$$$$$What’s Fixed$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.12.0
What’s Fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.12.0
What’s Fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.11.1
Thunderbird Desktop$$$Version 140.11.1esr | Released May 26; 2026$$$$$$What’s Changed$$$changed$$$There are no Thunderbird changes requiring release notes in this release
Mozilla Thunderbird ESR en-US x86 Version 140.11.1
Thunderbird Desktop$$$Version 140.11.1esr | Released May 26; 2026$$$$$$What’s Changed$$$changed$$$There are no Thunderbird changes requiring release notes in this release
Mozilla Thunderbird ESR en-US x86 Version 140.11.0
Thunderbird Desktop$$$Version 140.11.0esr | Released May 19; 2026$$$Check out the notes below for this version of Thunderbird. As always; you’re encouraged to tell us what you think; ask for help; or file a bug in Bugzilla.$$$$$$For help and a quick start on Thunderbird 140; see Thunderbird 140 Eclipse FAQ$$$$$$For more on all the new features in Thunderbird 140; see What’s New in Thunderbird 140.$$$$$$System Requirements: Details$$$$$$Windows: Windows 10 or later$$$Mac: macOS 10.15 or later$$$Linux: GTK+ 3.14 or higher$$$What’s Fixed$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.10.2
Thunderbird Desktop$$$Version 140.10.2esr | Released May 8; 2026$$$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.$$$$$$For help and a quick start on Thunderbird 140; see Thunderbird 140 Eclipse FAQ$$$$$$For more on all the new features in Thunderbird 140; see What’s New in Thunderbird 140.$$$$$$System Requirements: Details$$$$$$Windows: Windows 10 or later$$$Mac: macOS 10.15 or later$$$Linux: GTK+ 3.14 or higher$$$What’s Fixed$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.10.2
Thunderbird Desktop$$$Version 140.10.2esr | Released May 8; 2026$$$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.$$$$$$For help and a quick start on Thunderbird 140; see Thunderbird 140 Eclipse FAQ$$$$$$For more on all the new features in Thunderbird 140; see What’s New in Thunderbird 140.$$$$$$System Requirements: Details$$$$$$Windows: Windows 10 or later$$$Mac: macOS 10.15 or later$$$Linux: GTK+ 3.14 or higher$$$What’s Fixed$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.10.0
Thunderbird Desktop$$$Version 140.10.0esr | Released April 21; 2026$$$What’s Fixed$$$fixed$$$Newly translated strings were not available in Thunderbird$$$fixed$$$Security fixes - https://www.mozilla.org/en-US/security/advisories/mfsa2026-34/
Mozilla Thunderbird ESR en-US x86 Version 140.10.0
Thunderbird Desktop$$$Version 140.10.0esr | Released April 21; 2026$$$What’s Fixed$$$fixed$$$Newly translated strings were not available in Thunderbird$$$fixed$$$Security fixes - https://www.mozilla.org/en-US/security/advisories/mfsa2026-34/
Mozilla Thunderbird ESR en-US x86 Version 140.9.0
Thunderbird Desktop$$$Version 140.9.0esr | Released March 24; 2026$$$$$$What’s Fixed$$$fixed - Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140..8.0
Thunderbird Desktop$$$Version 140.8.0esr | Released February 24; 2026$$$What’s Fixed$$$fixed - Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140..8.0
Thunderbird Desktop$$$Version 140.8.0esr | Released February 24; 2026$$$What’s Fixed$$$fixed - Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.9.1
Thunderbird Desktop$$$Version 140.9.1esr | Released April 7; 2026$$$$$$What’s Fixed$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.9.1
Thunderbird Desktop$$$Version 140.9.1esr | Released April 7; 2026$$$$$$What’s Fixed$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.9.0
Thunderbird Desktop$$$Version 140.9.0esr | Released March 24; 2026$$$$$$What’s Fixed$$$fixed - Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.7.2
Thunderbird Desktop$$$Version 140.7.2esr | Released February 16; 2026$$$What’s Fixed$$$Security fixes - https://www.mozilla.org/en-US/security/advisories/mfsa2026-11/$$$$$$
Mozilla Thunderbird ESR en-US x86 Version 140.7.2
Thunderbird Desktop$$$Version 140.7.2esr | Released February 16; 2026$$$What’s Fixed$$$Security fixes - https://www.mozilla.org/en-US/security/advisories/mfsa2026-11/$$$$$$
Mozilla Thunderbird ESR en-US x86 Version 140.7.0
Thunderbird Desktop$$$Version 140.7.0esr | Released January 13; 2026$$$$$$What’s Fixed$$$fixed$$$Thunderbird could crash$$$$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.7.0
Thunderbird Desktop$$$Version 140.7.0esr | Released January 13; 2026$$$$$$What’s Fixed$$$fixed$$$Thunderbird could crash$$$$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.6.0
Thunderbird Desktop$$$Version 140.6.0esr | Released December 9; 2025$$$What’s Fixed$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.6.0
Thunderbird Desktop$$$Version 140.6.0esr | Released December 9; 2025$$$What’s Fixed$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.5.0
Thunderbird Desktop$$$Version 140.5.0esr | Released November 12; 2025$$$What’s New in Thunderbird 140.$$$What’s Fixed$$$Fixed$$$Could not drag and drop ICS file to Today Pane$$$$$$Fixed$$$With Thunderbird closed; clicking a mailto: link to send signed message failed$$$$$$Fixed$$$Upgrade from 128.x->140.x broke authentication for @att.net using Yahoo backend$$$$$$Fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.5.0
Thunderbird Desktop$$$Version 140.5.0esr | Released November 12; 2025$$$What’s New in Thunderbird 140.$$$What’s Fixed$$$Fixed$$$Could not drag and drop ICS file to Today Pane$$$$$$Fixed$$$With Thunderbird closed; clicking a mailto: link to send signed message failed$$$$$$Fixed$$$Upgrade from 128.x->140.x broke authentication for @att.net using Yahoo backend$$$$$$Fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.5.0
Thunderbird Desktop$$$Version 140.5.0esr | Released November 12; 2025$$$What’s New in Thunderbird 140.$$$What’s Fixed$$$Fixed$$$Could not drag and drop ICS file to Today Pane$$$$$$Fixed$$$With Thunderbird closed; clicking a mailto: link to send signed message failed$$$$$$Fixed$$$Upgrade from 128.x->140.x broke authentication for @att.net using Yahoo backend$$$$$$Fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.4.0
Thunderbird Desktop$$$Version 140.4.0esr | Released October 14; 2025$$$What’s Changed$$$changed$$$Account Hub is now disabled by default for second email account$$$$$$changed$$$Flatpak runtime has been updated to Freedesktop SDK 24.08$$$$$$What’s Fixed$$$fixed$$$Users could not read mail signed with OpenPGP v6 and PQC keys$$$$$$fixed$$$Image preview in Insert Image dialog failed with CSP error for web resources$$$$$$fixed$$$Emptying trash on exit did not work with some providers$$$$$$fixed$$$Thunderbird could crash when applying filters$$$$$$fixed$$$Users were unable to override expired mail server certificate$$$$$$fixed$$$Opening Website header link in RSS feed incorrectly re-encoded URL parameters$$$$$$fixed$$$Security fixes$$$
Mozilla Thunderbird ESR en-US x86 Version 140.4.0
Thunderbird Desktop$$$Version 140.4.0esr | Released October 14; 2025$$$What’s Changed$$$changed$$$Account Hub is now disabled by default for second email account$$$$$$changed$$$Flatpak runtime has been updated to Freedesktop SDK 24.08$$$$$$What’s Fixed$$$fixed$$$Users could not read mail signed with OpenPGP v6 and PQC keys$$$$$$fixed$$$Image preview in Insert Image dialog failed with CSP error for web resources$$$$$$fixed$$$Emptying trash on exit did not work with some providers$$$$$$fixed$$$Thunderbird could crash when applying filters$$$$$$fixed$$$Users were unable to override expired mail server certificate$$$$$$fixed$$$Opening Website header link in RSS feed incorrectly re-encoded URL parameters$$$$$$fixed$$$Security fixes$$$
Mozilla Thunderbird ESR en-US x86 Version 140.3.0
Thunderbird Desktop$$$Version 140.3.0esr | Released September 16; 2025$$$$$$What’s Fixed$$$fixed$$$Right-clicking List-ID -> Unsubscribe created double encoded draft subject$$$$$$fixed$$$Thunderbird could crash on startup$$$$$$fixed$$$Thunderbird could crash when importing mail$$$$$$fixed$$$Opening Website header link in RSS feed incorrectly re-encoded URL parameters$$$$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.3.0
Thunderbird Desktop$$$Version 140.3.0esr | Released September 16; 2025$$$$$$What’s Fixed$$$fixed$$$Right-clicking List-ID -> Unsubscribe created double encoded draft subject$$$$$$fixed$$$Thunderbird could crash on startup$$$$$$fixed$$$Thunderbird could crash when importing mail$$$$$$fixed$$$Opening Website header link in RSS feed incorrectly re-encoded URL parameters$$$$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.2.1
Thunderbird Desktop$$$Version 140.2.1esr | Released September 2; 2025.$$$$$$For more on all the new features in Thunderbird 140; see What’s New in Thunderbird 140.$$$What’s Fixed$$$fixed$$$Users could no longer send using smtp-relay.gmail.com$$$$$$fixed$$$Folder compaction could fail to complete due to folder write errors$$$$$$fixed$$$Creating an event or task from mail failed if the mail was opened in a tab$$$$$$
Mozilla Thunderbird ESR en-US x86 Version 140.2.1
Thunderbird Desktop$$$Version 140.2.1esr | Released September 2; 2025.$$$$$$For more on all the new features in Thunderbird 140; see What’s New in Thunderbird 140.$$$What’s Fixed$$$fixed$$$Users could no longer send using smtp-relay.gmail.com$$$$$$fixed$$$Folder compaction could fail to complete due to folder write errors$$$$$$fixed$$$Creating an event or task from mail failed if the mail was opened in a tab$$$$$$
Mozilla Thunderbird ESR en-US x86 Version 140.2.0
Thunderbird Desktop$$$Version 140.2.0esr | Released August 19; 2025$$$$$$What’s Fixed$$$fixed$$$Users were unable to use Fastmail calendars due to missing OAuth settings$$$$$$fixed$$$Account setup error handling was broken for Account hub$$$$$$fixed$$$Menu bar was hidden after updating from 128esr to 140esr$$$$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.2.0
Thunderbird Desktop$$$Version 140.2.0esr | Released August 19; 2025$$$$$$What’s Fixed$$$fixed$$$Users were unable to use Fastmail calendars due to missing OAuth settings$$$$$$fixed$$$Account setup error handling was broken for Account hub$$$$$$fixed$$$Menu bar was hidden after updating from 128esr to 140esr$$$$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 128.14.0
Thunderbird Desktop$$$Version 128.14.0esr | Released August 19; 2025$$$$$$What’s Fixed$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 140.0.1
Thunderbird Desktop$$$Version 140.0.1esr | Released July 10; 2025$$$Check out the notes below for this version of Thunderbird. As always; you’re encouraged to tell us what you think; ask for help; or file a bug in Bugzilla.$$$$$$For help and a quick start on Thunderbird 140; see Thunderbird 140 Eclipse FAQ$$$$$$For more on all the new features in Thunderbird 140; see What’s New in Thunderbird 140.$$$$$$System Requirements: Details$$$$$$Windows: Windows 10 or later$$$Mac: macOS 10.15 or later$$$Linux: GTK+ 3.14 or higher$$$What’s Fixed$$$fixed$$$Whats New page for 140esr was not displayed$$$$$$fixed$$$Status bar showed previously detached attachment when hovering over a new one$$$$$$fixed$$$URLs for hovered links in status bar could be immediately overwritten$$$$$$fixed$$$NNTP message pane did not show network error page when network was lost$$$$$$fixed$$$Inserting a link into an HTML mail did not work as expected$$$$$$fixed$$$Autoconfig no longer handled No such host errors correctly$$$$$$fixed$$$Thunderbird could crash on startup for POP3$$$$$$Known Issues$$$unresolved$$$Passwords are not remembered in 32-bit MAPI use without a compose window
Mozilla Thunderbird ESR en-US x86 Version 140.0.1
Thunderbird Desktop$$$Version 140.0.1esr | Released July 10; 2025$$$Check out the notes below for this version of Thunderbird. As always; you’re encouraged to tell us what you think; ask for help; or file a bug in Bugzilla.$$$$$$For help and a quick start on Thunderbird 140; see Thunderbird 140 Eclipse FAQ$$$$$$For more on all the new features in Thunderbird 140; see What’s New in Thunderbird 140.$$$$$$System Requirements: Details$$$$$$Windows: Windows 10 or later$$$Mac: macOS 10.15 or later$$$Linux: GTK+ 3.14 or higher$$$What’s Fixed$$$fixed$$$Whats New page for 140esr was not displayed$$$$$$fixed$$$Status bar showed previously detached attachment when hovering over a new one$$$$$$fixed$$$URLs for hovered links in status bar could be immediately overwritten$$$$$$fixed$$$NNTP message pane did not show network error page when network was lost$$$$$$fixed$$$Inserting a link into an HTML mail did not work as expected$$$$$$fixed$$$Autoconfig no longer handled No such host errors correctly$$$$$$fixed$$$Thunderbird could crash on startup for POP3$$$$$$Known Issues$$$unresolved$$$Passwords are not remembered in 32-bit MAPI use without a compose window
Mozilla Thunderbird ESR en-US x86 Version 140.0
Thunderbird Desktop$$$Version 140.0esr | Released July 7; 2025$$$$$$What’s New$$$new$$$Implemented enterprise policy to allow granular in-app notification control$$$$$$new$$$New mail alert now includes message disposition buttons$$$$$$new$$$Added Mark as Read and Delete actions to mail notifications$$$$$$new$$$Added Mark as Spam and Mark as Starred actions to mail notifications$$$$$$new$$$Support dark reader for the message pane$$$$$$new$$$Messages are automatically adapted to dark mode with a quick toggle in the header$$$$$$new$$$Message filters are now available in the Folder Pane context menu$$$$$$new$$$Added horizontal threadpane scrolling mail.threadpane.table.horizontal_scroll$$$$$$new$$$Implemented customizable row count for Cards View in Appearance settings$$$$$$new$$$Implemented ability to manually sort folders in the folder pane$$$$$$new$$$New Appearance Settings UI to globally control message threading/sorting order$$$$$$new$$$Added checkbox to select/unselect all calendars in the calendar setup wizard$$$$$$new$$$Account Hub enabled by default for second email setup$$$$$$new$$$Add-ons: Added support for specifying a cookieStoreId when creating a space$$$$$$new$$$Added Thunderbird-specific loading symbol$$$$$$What’s Changed$$$changed$$$Removed obsolete preference extensions.overlayloader.loglevel$$$$$$changed$$$CardDAV address books and calendars now use the same OAuth2 code as mail$$$$$$changed$$$Display junk state and allow toggling it from top of message context menu$$$$$$changed$$$Subscribe/Unsubscribe buttons were removed from the IMAP subscribe dialog$$$$$$changed$$$Ignore unsupported subkeys/signatures when importing compliant OpenPGP keys$$$$$$changed$$$Some generic appearance settings were moved from General to Appearance section$$$$$$changed$$$Add-ons: browser.messages.listAttachments() now returns attachment headers$$$$$$changed$$$Set calendar.alarms.showmissed preference to false by default$$$$$$changed$$$Exporting a calendar to .ics did not include the calendar name$$$$$$What’s Fixed$$$fixed$$$Chrome URLs were opened in an external browser$$$$$$fixed$$$Race condition in folder compaction could cause unexpected behavior$$$$$$fixed$$$Crash could occur when shutting down during MAPI send$$$$$$fixed$$$Message preview truncation in notifications improved$$$$$$fixed$$$Thunderbird could crash when setting message compose headers$$$$$$fixed$$$Links in the OAuth authentication window did not open when clicked$$$$$$fixed$$$Mail window could stop functioning during and after folder compaction$$$$$$fixed$$$Error message for compacting a corrupted local folder was not useful$$$$$$fixed$$$Repair folder did not fix mbox files produced on MacOS before Thunderbird 1.0$$$$$$fixed$$$Wrong day of week displayed for some emails$$$$$$fixed$$$Edit menu entries missing when group header selected in Grouped by sort view$$$$$$fixed$$$IMAP folder Undelete performed Delete when mixed messages were selected$$$$$$fixed$$$View Message Source no longer worked for multiple selected messages$$$$$$fixed$$$Creating a new mail account from the menu bar in a message window failed$$$$$$fixed$$$Feed subscriptions were broken$$$$$$fixed$$$Feed body was not rendered when Message Body As formatting option selected$$$$$$fixed$$$Thunderbird could show incorrect From and To fields for mailing list emails$$$$$$fixed$$$mail.compose.other.header wrongly added fields to message preview pane headers$$$$$$fixed$$$Deleting or detaching attachments in a saved .eml file appeared to work but failed$$$$$$fixed$$$In RSS feeds; the space bar did not scroll the message like it did in emails$$$$$$fixed$$$Unchecking Show all headers in Message Header Settings closed dialog$$$$$$fixed$$$Some webpage links could be forced to open in Thunderbird$$$$$$fixed$$$Right-click of message in cross-folder virtual folder wrongly selected it$$$$$$fixed$$$Messages deleted from a cross-folder search view could not be undeleted$$$$$$fixed$$$Cards view replies button remained styled without new messages in thread$$$$$$fixed$$$Subscribe window Show items that contain should not have been
Mozilla Thunderbird ESR en-US x86 Version 128.12.0
What’s Fixed$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 128.12.0
What’s Fixed$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 128.12.0
What’s Fixed$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 128.11.1
Version 128.11.1esr | Released June 10; 2025$$$What’s Fixed$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 128.11.1
Version 128.11.1esr | Released June 10; 2025$$$What’s Fixed$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 128.11.0
Version 128.11.0esr | Released May 27; 2025$$$What’s Fixed$$$fixed$$$Thunderbird could crash if message copying to Sent folder was interrupted$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 128.10.0
Thunderbird Desktop$$$Version 128.10.0esr | Released April 29; 2025$$$$$$What’s Changed$$$changed$$$Changed color override defaults with high contrast mode on macOS and Linux$$$$$$What’s Fixed$$$fixed$$$Using Delete column in Search Messages... window could delete other messages$$$$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 128.9.1
Thunderbird Desktop$$$Version 128.9.1esr | Released April 4; 2025$$$What’s Fixed$$$fixed$$$Added delay to built-in notifications when new profile is created in offline mode
Mozilla Thunderbird ESR en-US x86 Version 128.8.1
What’s Fixed$$$fixed$$$PGP/MIME signed message with a missing signature did not display$$$$$$fixed$$$Some emails forwarded as attachments used the wrong MIME type
Mozilla Thunderbird ESR en-US x86 Version 128.7.0
What’s Fixed$$$fixed$$$Images inside links could zoom when clicked instead of opening the link$$$$$$fixed$$$Compacting an empty folder failed with write error$$$$$$fixed$$$Compacting of IMAP folder with corrupted local storage failed with write error$$$$$$fixed$$$After restart; all restored tabs with opened PDFs showed the same attachment$$$$$$fixed$$$Exceptions during CalDAV item processing would halt subsequent item handling$$$$$$fixed$$$Context menu was unable to move email address to a different field$$$$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 128.7.0
What’s Fixed$$$fixed$$$Images inside links could zoom when clicked instead of opening the link$$$$$$fixed$$$Compacting an empty folder failed with write error$$$$$$fixed$$$Compacting of IMAP folder with corrupted local storage failed with write error$$$$$$fixed$$$After restart; all restored tabs with opened PDFs showed the same attachment$$$$$$fixed$$$Exceptions during CalDAV item processing would halt subsequent item handling$$$$$$fixed$$$Context menu was unable to move email address to a different field$$$$$$fixed$$$Security fixes
Mozilla Thunderbird ESR en-US x86 Version 115.11.1
What’s New$$$New$$$Added a short anonymous survey that a small number of users will be randomly asked to complete
Mozilla Thunderbird ESR en-US x86 Version 115.11.0
What’s Fixed$$$Fixed$$$Splitter arrow between task list and task description did not behave as expected$$$$$$Fixed$$$Calendar Event Attendees dialog had incorrectly sized rows$$$$$$Fixed$$$Security fixes
