Mozilla Thunderbird: baixar versions anteriors

What’s Fixed
fixed
Dialogs had transparent backgrounds with third party themes
fixed
Security fixes

What’s Changed
changed
Quick filter responsiveness has been improved
changed
ExtensionSettings policy installs add-ons from update_url when install_url not set
What’s Fixed
fixed
Copy Link Location only copied detached attachment filenames instead of full paths
fixed
Thunderbird could crash while performing a Body search
fixed
Troubleshooting falsely reported crash reports were not configured when available
fixed
Right-clicking inline images zoomed them instead of opening the context menu
fixed
Switching to Unified Folders could leave All Folders enabled and not change view
fixed
Archived Inbox folders ignored localized names and appeared as "INBOX"
fixed
OpenPGP key management had unlocking, handle leak, and protection state issues
fixed
OpenPGP backup password text could not be copied and context menu was transparent
fixed
Quick Filter failed to match accented names when searching without accents
fixed
Holding Ctrl+Enter could unintentionally confirm the send prompt and send duplicates
fixed
Plain-text inline forwards omitted signatures placed below the quote
fixed
Remote content exceptions without a scheme only applied to HTTP, not HTTPS
fixed
Remote content exceptions incorrectly allowed wildcard hostnames like *.example.com
fixed
Saved CalDAV/CardDAV credentials could be forgotten after restarting Thunderbird
fixed
CardDAV setup failed without prompting for a password
fixed
CardDAV address book sync failed to fetch newly added contacts
fixed
CardDAV updates could corrupt vCard REV timestamps
fixed
CardDAV discovery could fail on valid multi-status responses with mixed status codes
fixed
SMTP Kerberos authentication failed on Linux with STARTTLS
fixed
POP accounts repeatedly showed connection errors when Thunderbird started offline
fixed
Matrix SSO with Save Token disabled reopened the login flow indefinitely
fixed
RSS filtering could lose tags and stall processing of later feed items
fixed
CalDAV password prompts did not identify the username or calendar
fixed
Calendar event edits could fail with localization error in the event dialog
fixed
Updated calendar credentials were not saved from the authentication prompt
fixed
Visual and UX improvements
fixed
Security fixes

What’s Fixed
fixed
EWS/Graph messages could crash Thunderbird when handling relative URL fragments

What’s New
new
Enterprise policy DisableChat disables Thunderbird Chat functionality
new
Enterprise policy DisableFileLink disables Thunderbird FileLink functionality
What’s Changed
changed
Preference mailnews.headers.minNumHeaders has been removed
changed
Allow viewing remote content in OpenPGP messages encrypted with integrity protection
changed
RNP command-line utilities are no longer included with Thunderbird
changed
IMAP/POP manual config port field is now optional
changed
Thundermail built-in add-on updated to v2.0.16
What’s Fixed
fixed
Ctrl+Shift+K could fail to open the Quick Filter UI
fixed
Message list could show the wrong sender for messages
fixed
Status bar could remain active and cause 100% CPU usage after activity ended
fixed
OpenPGP discovery failed to find replacement keys after a key was revoked
fixed
Valid RSA OpenPGP keys could be rejected, preventing encryption
fixed
Sent messages could silently fail to save to the IMAP Sent folder
fixed
Sending message did not fail gracefully with malformed references header
fixed
Thunderbird could hang when waiting for IMAP server greeting during account setup
fixed
Account Hub account creation could fail with malformed URI
fixed
Custom OAuth Endpoint Host incorrectly required a full URL instead of a domain
fixed
Message filters could falsely match when evaluating search term failures
fixed
CardDAV address books could fail to sync when no password prompt was needed
fixed
Yahoo emails appeared blank with MIME handlers disabled via mailnews.display.disallow_mime_handlers
fixed
Pending moves within the same IMAP account could make messages disappear
fixed
Inline images could disappear after editing and resaving drafts
fixed
SMTP OAuth2 failed when large access token exceeded command line length limit
fixed
Gmail OAuth2 authentication could intermittently fail on Windows
fixed
Exchange NTLM authentication failed when updated passwords were not saved
fixed
SMTP AUTH LOGIN could fail after username challenges and close the connection
fixed
AppUpdatePin policy did not prevent Thunderbird from updating beyond pinned version
fixed
Recurring events could appear after their configured end date
fixed
CalDAV task body could remain outdated after syncing changes from another client
fixed
CalDAV invitations could fail when accepted before the calendar synced
fixed
Visual and UX improvements
fixed
Security fixes

What’s Fixed
fixed
Thunderbird could crash when saving a message

What’s New
new
OpenPGP key properties can print debug information to the Error Console
new
External browser login flow enabled for Yandex
new
Custom OAuth support for issuer ID and client secret field for IMAP and POP3
new
Custom OAuth support for POP3
new
Enterprise policy DisableUpdateSettings prevents users from changing update settings
new
Enterprise policy DisableDataCollectionSettings prevents users from changing data collection setting
new
Enterprise policy DisableMessageForwardingFilters prevents message filters from automatically forwarding messages
What’s Changed
changed
Preference mail.offer_experimental_features renamed to mail.experimental_features_settings.enabled
changed
Thundermail built-in add-on updated to v2.0.11
What’s Fixed
fixed
Detached attachment links were truncated when folder path contained &
fixed
Opening a PDF attachment in a tab displayed empty tab
fixed
POP3 folders with names over 55 characters could become duplicated after upgrading
fixed
Folders with invalid filename characters could show hashed names if cache was lost
fixed
Save All, Detach All, and Delete All failed after deleting one attachment
fixed
Renaming folders could reset folder settings
fixed
Subscribing an IMAP folder and subfolder together failed to subscribe the subfolder
fixed
Some newly fetched POP messages were not marked with new star after startup
fixed
Sorting after deleting the only child message removed the parent from view
fixed
OpenPGP signing failed with external GnuPG when the primary key could not sign
fixed
Remote content could load in encrypted messages opened from files
fixed
Sent message with expired S/MIME certificate wrongly showed untrusted CA warning
fixed
PDF attachments from compose windows could wrongly be detected as HTML
fixed
Saving unconfirmed recipients could create invalid address pills with >>
fixed
External browser OAuth failed when a browser preconnection closed first
fixed
Users could not set up custom OAuth for Exchange accounts
fixed
Pressing Enter on Windows system tray icon did not restore Thunderbird window
fixed
Inline attachments incorrectly changed the message channel content type
fixed
Message loading was slow while discovering large numbers of IMAP folders
fixed
SMTP authentication failed when usernames contained non-ASCII characters
fixed
Unsupported EWS archive folder prevented all mailbox folders from syncing
fixed
Manual Get Messages failed after startup until toggling offline mode
fixed
Case differences in CalDAV email addresses caused duplicate invitations
fixed
Accepted CalDAV invitations could be saved to the wrong calendar
fixed
Visual and UX improvements
fixed
Security fixes

What’s Fixed
fixed
Empty filter search values matched every message

What’s New
new
S/MIME popup shows signature, digest, encryption algorithms and key sizes
new
Default address book for manually added contacts configurable with mail.addr_book.add_item_default_uri
new
Enterprise policy DisableQRExport can disable QR export
new
OAuth add-ons can override built-in settings for selected domains and hostnames
new
Manual account config streamlined with Exchange, Graph, and custom OAuth support
new
Custom OAuth support for IMAP and SMTP servers
new
PKCE and external browser fields added to custom OAuth settings
new
Enterprise policy DisableExperimentalFeatures for disabling experimental features
What’s Fixed
fixed
Unread count dock badge disappeared on macOS restart when no mail window opened
fixed
IMAP tags did not sync automatically across clients
fixed
Embedded SVG images appeared broken when Display Attachments Inline was disabled
fixed
Holding arrow keys failed to smoothly navigate the folder pane
fixed
Mark and Tag menu bar items were disabled in search results
fixed
Quick Filter ignored address book display names shown in message lists and headers
fixed
Attachment filters could disappear or return no results in global search
fixed
Body search failed for quoted-printable messages ending on a soft line break
fixed
Failed encrypted send did not preserve draft
fixed
Failed account setup left an incoming server that blocked account recreation
fixed
Removing an account did not remove its OAuth token from the password manager
fixed
Account Hub prompted for calendar credentials immediately after successful login
fixed
Filters could copy empty messages to Local Folders during startup mail download
fixed
Closing message filters wrongly warned completed newsgroup filters were running
fixed
Autoscroll icon was missing directional arrows in scrollable messages
fixed
Apple Mail text attachments may not appear in MIME messages
fixed
Forwarded messages could display incorrect encoding
fixed
Thunderbird could crash due to improper database memory handling
fixed
Thunderbird could crash on shutdown while waiting for OAuth2 password entry
fixed
Thunderbird could crash while loading mail folders
fixed
Custom OAuth could not be disabled
fixed
Legacy IMAP tag changes were not sent to the server and reverted after refresh
fixed
Deleting an Exchange account retained the outgoing server settings
fixed
CalDAV calendars with offline support could stop fully synchronizing events
fixed
Offline cached ICS calendar changes were silently lost after reconnecting
fixed
Thunderbird upgrade disabled composition toolbar
fixed
Thunderbird upgrade disabled Settings menu for versions before macOS 13
fixed
Windows jump list menu no longer functioned correctly
fixed
Visual and UX improvements
fixed
Security fixes

What’s New
new
Preview functionality for attachments on macOS
new
CMS message with AuthEnvelopedData can be decrypted properly in Thunderbird
new
Global search results can open in list view by default with new setting
new
"Copy To" folder context menu added for message/rfc822 attachments
new
Optional system tray mode that hides Thunderbird when the last window closes
new
Support for dragging message/rfc822 type MIME attachments to folder tree
new
Microsoft Graph enabled for Microsoft 365
What’s Fixed
fixed
Remote content warnings appeared despite sender block exceptions being applied
fixed
Collapsed saved-search folders did not deselect their subfolders
fixed
Server-designated special folder flags could be removed until restart
fixed
Messages could render excessive trailing blank lines
fixed
Copying a message subject included the "Subject:" label in copied text
fixed
Moving IMAP folders to Local Folders could delete messages after copy failures
fixed
7-bit clean unobtrusive signature payloads were unnecessarily base64 encoded
fixed
DisablePasswordReveal policy failed to prevent revealing saved passwords
fixed
Account setup tried local-part usernames before full email addresses
fixed
Read-only CardDAV address books were incorrectly treated as writable
fixed
Autoscroll icon was missing directional arrows in scrollable messages
fixed
Blank 1970-dated messages could appear from incomplete message file copies
fixed
Opening drafts or templates with invalid quoted-printable data could crash Thunderbird
fixed
Thunderbird could crash when inserting a message header into database cache
fixed
IMAP repeatedly notified for messages already read on another device
fixed
Dragging EWS search folders to Trash caused Thunderbird to crash
fixed
Folder compaction displayed incorrect disk space recovery estimates
fixed
Custom OAuth settings for EWS account overwrote original account's settings
fixed
Thunderbird could crash when going offline with an active IMAP IDLE connection
fixed
Thunderbird could crash while running online mail search
fixed
Exchange accounts could show repeated false login failures during authentication
fixed
Expired newsgroup articles showed an insecure "click here" purge link
fixed
IMAP attachments appeared empty after messages were moved by filters
fixed
Default special-folder names could reference nonexistent server folders
fixed
Thunderbird macOS fell back to Software WebRender after GPU process launch failures
fixed
New RSS subscriptions used updated dates instead of published dates
fixed
Calendar sort order was not preserved across Thunderbird restarts
fixed
"All calendars are disabled" banner reappeared after enabling a calendar
fixed
Dismissed CalDAV reminders could permanently stop future event notifications
fixed
Read-only CardDAV calendars were incorrectly treated as writable
fixed
CalDAV sync failed when server responses used UTF-16 encoding
fixed
Visual and UX improvements
fixed
Security fixes

What’s Fixed
fixed
Thunderbird could crash when saving a sent Exchange message

What’s Changed
changed
There are no Thunderbird changes requiring release notes in this release

What’s Fixed
fixed
New Message and New Event buttons were unreadable in right-to-left locales
fixed
OpenPGP sending failed when an accepted key lacked a valid encryption subkey

What’s New
new
Unified folders now display account color indicator with account name tooltip
new
OAuth login for mail accounts now opens in default web browser
new
Thundermail services can now be used without installing an add-on
new
OAuth responses now verify issuer fields and reject missing required issuers
What’s Changed
changed
Removed Odnoklassniki chat setup and directed users to XMPP configuration
What’s Fixed
fixed
Ctrl+S did not save PDF attachments opened in Thunderbird tabs
fixed
TLS errors incorrectly reported all unknown failures as untrusted certificates
fixed
Thunderbird could crash during shutdown
fixed
Thunderbird could crash when copying an empty list of messages
fixed
New mail alerts incorrectly sized or positioned on some multi-monitor setups
fixed
Old IMAP profile migration deleted INBOX and other mailbox files
fixed
Space bar did not scroll in PDF attachments opened from emails
fixed
'Search Messages' shortcut (Ctrl+Shift+F) failed in standalone message window
fixed
Folder location widget used non-localised name
fixed
Empty confirmation dialog when more messages opened in tabs than mailnews.open_tab_warning
fixed
Removing tags from IMAP messages could fail and tags reappeared after refresh
fixed
Folder pane could not be horizontally resized in additional 3-pane tabs
fixed
Global search failed to display inaccessible messages found in local folders
fixed
Numeric subfolders were sorted alphabetically instead of naturally
fixed
Virtual folder folder-picker showed unlabeled IM account as selectable folder
fixed
Virtual folders failed to preserve the online search setting
fixed
Apple Mail OpenPGP emails failed to decrypt due to hidden recipient key ID
fixed
OpenPGP import of public key with experimental packets failed with unclear error
fixed
Performance issue when decrypting encrypted messages
fixed
Opening messages with OpenPGP keys was slow and blocked the UI for large keyrings
fixed
OpenPGP key refresh failed when fingerprint lookup returned multiple results
fixed
Invalid S/MIME encryption certificate caused misleading send errors
fixed
Esc cleared quick filter pin after changing folder
fixed
Dragging email address between compose windows failed to add recipients
fixed
Thunderbird could crash when using Find and Replace All
fixed
Sending Message dialog got stuck on "Filter complete." after successful send
fixed
Compose with PDF attachments opened PDFs instead of creating a new email
fixed
Attachments opened via -compose on Windows could use incorrect filenames
fixed
Ctrl+Enter opened attachment instead of sending the message
fixed
Compose window remained open when delayed sending was enabled
fixed
Account hub showed connection security instead of actual authentication method
fixed
Account Hub GSSAPI autoconfiguration incorrectly prompted for a password
fixed
New identity dialog lacked reply-matching and end-to-end encryption settings
fixed
Account Hub manual EWS setup lacked OAuth authentication option
fixed
Thunderbird could fail to shut down cleanly during active OAuth requests
fixed
Account Hub kept OAuth selected after changing to hostname without OAuth support
fixed
Account Hub showed a false error when returning from EWS manual configuration
fixed
Account Hub autodetect wrongly prompted for a password when auth was unavailable
fixed
QR exports with SMTP passwords generated invalid data for Thunderbird for Android
fixed
Message Filters 'Run Now' button remained disabled after filter run or mail check
fixed
Redirected CardDAV URLs resolved relative URLs against the wrong host
fixed
Thunderbird could crash when completing folder copy/move
fixed
Forwarding some Apple Mail messages incorrectly attached inline text as a file
fixed
Auto-compaction could corrupt database and cause crashes during syncs
fixed
NNTP server with invalid TLS certificate could not be added to certificate exceptions
fixed
Sent message in EWS account showed message as unread in the sent items folder
fixed
EWS NTLM authentication trig

What’s Fixed
fixed
Reply All button was missing for some EWS messages with multiple recipients
fixed
Security fixes

What’s New
new
SecurityDevices enabled in enterprise policies
new
One-click account setup for Thundermail accounts
What’s Changed
changed
Use 'Add' instead of 'New' for account, calendar, address book creation buttons
changed
GMail OAuth updated to use PKCE
changed
Hostname of mail server is also checked when detecting address books and calendars
changed
Updated about:rights to replace local with hosted url
changed
'Hide completed tasks' now also hides cancelled tasks
What’s Fixed
fixed
New mail alerts appeared on wrong monitor in three-monitor setup
fixed
Spam messages triggered new mail notifications before being moved to Spam folder
fixed
Filtered IMAP or NNTP subscriptions were lost after closing Subscribe dialog
fixed
'Download Headers' dialog for newsgroups failed to open
fixed
Messages nested deeper than 255 levels disappeared from threading view
fixed
Performing Delete followed by Undo on thread parent message could corrupt view
fixed
Single messages still appeared collapsible after thread members were deleted
fixed
Updated threads remained misordered until folder refresh or resort
fixed
Non-threaded subject sorting separated 'RE:' replies from original messages
fixed
BCC recipients were included in signed email headers
fixed
Performance issue when decrypting encrypted messages
fixed
Filter search on Body missed draft messages containing German umlauts
fixed
Thunderbird could crash during local message search
fixed
Blocked file warning showed without 'Unblock File' button in compose window
fixed
Forwarding/Redirecting Exchange messages failed with NS_ERROR_OUT_OF_MEMORY
fixed
Compose window closed early and send progress dialog hung after NNTP failure
fixed
Compose window stayed open after sending when mailnews.sendInBackground set
fixed
Microsoft OAuth2 failed when HTTPS localhost redirect was not intercepted
fixed
Pasting contact photos stopped working when photo button had focus
fixed
Filter dialog lacked focus ring and had poorly distinguishable buttons
fixed
Subfolder kept stale accessibility unread count after unread messages were deleted
fixed
'Edit as New Message' and inline 'Forward' not possible with PGP-signed messages
fixed
Various MIME improvements
fixed
EWS messages could go missing from folder view
fixed
IMAP "Show only subscribed folders" could not be changed without restart
fixed
Unable to delete more than 1000 messages at a time on Microsoft 365
fixed
EWS folders in Trash were moved to Trash again instead of being hard deleted
fixed
IMAP notifications repeated for emails read on another device after sleep wake
fixed
POP3 deadlocked when server went silent without closing socket
fixed
Calendar acceptance no longer distinguished between single occurrence and series
fixed
Transparent popups on macOS made calendar event editing difficult
fixed
Duplicate attendees were added to invitations instead of being filtered out
fixed
Task percentage complete was not preserved separately from status in tooltips
fixed
Visual and UX improvements
fixed
Security fixes

What’s Fixed
fixed
Forwarding/Redirecting Exchange messages failed with NS_ERROR_OUT_OF_MEMORY

What’s New
new
Enable Thundermail OAuth sign-in with account auto-configuration
new
Enable users to override OAuth provider details for EWS accounts
new
Tasks can be sorted by created or modified date
What’s Changed
changed
Reinstated default application check when Thunderbird starts
changed
OpenPGP public key no longer attached by default in signed-only messages
What’s Fixed
fixed
Thunderbird could crash when processing message headers
fixed
Thunderbird could crash on startup
fixed
Calendar view tabs were not properly keyboard accessible
fixed
Thunderbird could crash when processing new incoming messages
fixed
On macOS, dragging attachments out of Thunderbird created multiple copies
fixed
Cancelling a newsgroup posting was not possible
fixed
Some IMAP emails showed current time instead of correct received date
fixed
Search result count was missing when using 'Find in Message' or Ctrl+F
fixed
Search results showed older irrelevant emails before newer exact matches
fixed
Reply with selected text lost formatting for HTML messages containing </pre>
fixed
Multipart/related attachments were not preserved when editing or forwarding
fixed
Forwarded malformed MIME email had empty body and extra attachment
fixed
OWL add-on description was not visible in Account Hub for non-en-US locales
fixed
Account Hub prompted for password after OAuth login, causing Outlook setup failure
fixed
Auto-discovered Account Hub values were not preserved for manual editing
fixed
Account Hub links for encryption and signature opened the wrong account
fixed
Virtual folders did not update correctly for filtered POP3 messages
fixed
Thunderbird could crash in spam filtering
fixed
Using thunderbird -compose with double quotes made last email address invalid
fixed
With auto-mark-read disabled, large mail still marked as read during load delay
fixed
It was not possible to create date-only all-day tasks
fixed
Task context menu (right-click) had several disabled menu items
fixed
'Current Tasks' view showed past and finished tasks instead of only unfinished
fixed
Visual and UX improvements
fixed
Security fixes

What’s Fixed
fixed
Security fixes

What’s Fixed
fixed
Thunderbird could crash when processing message headers
fixed
Security fixes

What’s New
new
'Recent Destinations' in General Settings now supports alphabetical sorting
new
Added support for generating Unobtrusive Signatures (OpenPGP)
new
Message body search enabled for OpenPGP and S/MIME encrypted messages
new
Account hub is opened on the first run of Thunderbird
new
Address book cards can be copied to the clipboard as vCard
new
Custom Accent Color can be chosen in Appearance Settings
new
Calendar month/multiweek views are now scrollable with touch screen
new
PDF pages can be reorganized directly in the PDF viewer
What’s Changed
changed
Flatpak beta app ID changed from org.mozilla.Thunderbird to org.mozilla.thunderbird
What’s Fixed
fixed
Unknown command-line arguments passed to Thunderbird did not print warning
fixed
Thunderbird could crash when creating a folder
fixed
Saved email filenames were not not always cross-platform safe
fixed
Compose progress dialog used unlocalised folder name
fixed
Clicking on a folder in the folder pane did not always open folder
fixed
Could not scroll to message bottom or view all attachments in some cases
fixed
Accounts could be listed twice after adding new account
fixed
Account Hub manual configuration was missing OAuth2 option
fixed
Microsoft Store installs did not open when clicking 'news://' link or .eml file
fixed
Folder states were not exposed to screen readers in saved search properties
fixed
Mailbox name was not announced and message count was incorrect for screen readers
fixed
POP3 could stop downloading mail until restart
fixed
Exchange servers/clients caused memory leaks by holding mutual references
fixed
Authentication could fail for some exchange accounts
fixed
'Move to New Window' option for the calendar was disabled
fixed
Calendar view had date and time axes swapped
fixed
Visual and UX improvements
fixed
Security fixes

What’s Fixed
fixed
Security fixes

What’s Changed
changed
There are no Thunderbird changes requiring release notes in this release

What’s New
new
Enable exporting selected address book cards
new
Starred EWS messages now persist across devices
What’s Changed
changed
Address books are now created in Account Hub
What’s Fixed
fixed
Shift-click for 'Edit' button in drafts header view did not work
fixed
"Replace All" in Compose did not update plain text until dialog closed
fixed
"Repair text encoding" could duplicate recipient and attachments
fixed
Link colors were difficult to read in dark themes
fixed
Pressing Delete on Trash folder could remove it without confirmation
fixed
Renaming of a 'unified folder' created a duplicate
fixed
Folder tree "new messages" star no longer displayed
fixed
Reason for revoked certificate was not shown
fixed
"Open and show" for OpenPGP signed message could fail if headers after content-type
fixed
Encrypted Gmail CSE emails with outer opaque S/MIME were not readable
fixed
"Generate and save a CSR file as... " no longer worked for S/MIME
fixed
Cancelled attachment reminder in compose did not return focus to message body
fixed
Thunderbird could crash while importing mail thread
fixed
Unlabeled column visibility toggle button was not announced by screen readers
fixed
Could not save message to external file from EWS account
fixed
"After Sending" filters were not working correctly
fixed
Thunderbird did not report refused POP3 connection
fixed
EWS messages could fail to sync in some scenarios
fixed
Remove message body retention policy was not functional
fixed
Publish Calendar only showed empty OK/Cancel popup and did not publish
fixed
Dismissed Gmail calendar reminder did nothing and item stayed visible
fixed
Could not export local calendar as HTML
fixed
Cancelled filter edit dialog closed the message filter dialog
fixed
Visual and UX improvements
fixed
Security fixes

What’s Fixed
fixed
LDAP with password stopped working in 148.0

What’s New
new
Accessiblity is improved in various tree views
new
'Favorites' added as destination for 'Move To' and 'File' buttons
new
Add mail.openpgp.load_untested_gpgme_version to load untested GPGME version
new
NTLM is exposed as an available authentication method for EWS accounts
What’s Changed
changed
Read folders are now removed from Unread Folders view
changed
Yahoo, AT&T, AOL accounts are switched to PKCE, a more secure auth protocol
What’s Fixed
fixed
Periodic new mail checks silently stopped after sleep or network outages
fixed
Donation banner stole focus when Thunderbird was running in the background
fixed
Status bar messages displayed unlocalizedd folder names or IMAP mailbox names
fixed
New Folder dialog allowed invalid folder creation without a selected parent folder
fixed
New/unread messages in collapsed thread were not obvious enough
fixed
Invalidly signed unencrypted emails were indicated as worse than unsigned ones
fixed
Untagged messages were not working correctly with quick filter
fixed
Calendar/address book sections were shown in Account Hub when there were none
fixed
Shortcuts could be executed on background mail window while in Account Hub
fixed
Adding a Gmail account prompted for OAuth during auto config
fixed
New password-based Exchange accounts failed to save passwords in login manager
fixed
'Move Message to' filter action was not logged
fixed
Unknown OAuth providers were not allowed during EWS manual config in AccountHub
fixed
Saved search in unified folder resulted in server error
fixed
EWS password prompt looped endlessly if the password was empty
fixed
Account Hub manual configuration flow for Exchange accounts was incorrect
fixed
Google calendars had broken RSVP logic and wrong organizer on new events
fixed
CalDAV calendars that invited calendar alias did not give all response options
fixed
CalDAV calendar with multiple addresses could crash on multi-attendee invites
fixed
iCal imports misread unknown timezones as GMT, creating events at wrong times
fixed
Visual and UX improvements
fixed
Security fixes

What’s Fixed
fixed
Security fixes

What’s Fixed
fixed
Thunderbird crashed during search, even when not actively searching
fixed
Security fixes

What’s New
new
Add "Show Full Path" folder pane option for compact view modes
new
Add `mail.useLocalizedFolderNames' to toggle special folder name localization
What’s Changed
changed
Special folders are now localized based on a restricted set of names
What’s Fixed
fixed
Selected status and priority was not displayed in search widgets
fixed
Compacting multiple folders failed and did not compact
fixed
Resetting manual folder sorting did not work for sub folders
fixed
Unified archive subfolders could show wrong names and no messages
fixed
Folders with deep hierarchy and long folder names could fail to display
fixed
Moving saved search/virtual folder under IMAP could fail
fixed
"Open and Show" for OpenPGP-signed message (.eml) did not work
fixed
"Search Messages" search did not finish due to unparsable local folders
fixed
Compose command line flag no longer worked correctly
fixed
Search for "Attachment" in Settings menu did not find "Files and Attachments"
fixed
Account Hub did not show error message on failure when creating OAuth2 EWS account
fixed
Thunderbird could crash during exchange address account setup
fixed
Japanese locale users could not create message filters
fixed
Moving virtual folder within maildir based IMAP or local folder could fail
fixed
Thunderbird could crash when marking all messages as read
fixed
Startup could be slow with large number of folders not using subscriptions
fixed
EWS message send that required a password errored instead of prompting
fixed
EWS HTTP 500 backoff errors were not handled gracefully
fixed
SMTP sending could hang when when multiple messages queued for sending
fixed
Thunderbird could crash when emptying EWS trash
fixed
Broken feed icon could prevent updating of feeds
fixed
Calendar did not alert user for connection issues
fixed
Creation of tasks with Start or Due date was not possible
fixed
Visual and UX improvements
fixed
Security fixes

What’s Fixed
fixed
Reverted fix that localized consistent special folder names in server’s language

What’s New
new
Enabled configuration of preferred OpenPGP keyserver via the UI
What’s Changed
changed
Existing logins are migrated to make use of more modern AES cryptography
What’s Fixed
fixed
Memory was not cleaned up after opening New Window from folder pane context menu
fixed
Thunderbird could crash in server subscription logic
fixed
Importing a vCard only displayed VCF files in the file picker
fixed
Could not distinguish folders with same name in 'Recent Destinations' and 'Favorites'
fixed
Could not compose new message if the folder pane was empty
fixed
'Delete' was missing from context menu when multiple IMAP folders were selected
fixed
'Delete' button in unified toolbar could delete attachments instead of message
fixed
'Recent destinations' submenu was not sorted by time of modification
fixed
Account column could display incorrect account name
fixed
'Tag' submenu of mail context menu could be populated incorrectly
fixed
Extending the expiration date of OpenPGP key set incorrect date
fixed
Could not sign/encrypt (PGP) when using -compose and Thunderbird was not running
fixed
Account Hub email success messages were not always accurate about config source
fixed
Account Hub advanced config setup did not include default outgoing config
fixed
Account Hub local address book creation could continue with blank name
fixed
Detailed security exception dialog was not shown when adding certificate exception
fixed
The default account could be reset after restart if uninitialized
fixed
Opening a vCard (.vcf) from file manager or CLI did not work in some cases
fixed
Dragging attachments on macOS to folder or desktop no longer worked
fixed
EWS folder properties "Select this folder for offline use" did not work
fixed
Thunderbird could crash when mail folder was renamed or moved
fixed
Account Hub could fail when manually creating EWS account
fixed
'Offline' folder flag for EWS folders was reset on restart
fixed
'Open with' of Microsoft Office attachment did not mark file with MOTW label
fixed
Visual and UX improvements
fixed
Security fixes

What’s New
new
Enable support for DNS over HTTPS
new
Account Hub email manual config option added
new
Add manual configuration to EWS account creation
new
Enable support for Microsoft Exchange via Exchange Web Services
What’s Changed
changed
Skype has been retired and therefore dropped from Address book IM selection
changed
Removed pref default_supports_diskspace.{HOST}
changed
Removed pref default_offline_support_level.{HOST}
changed
Use of the string "Junk" has been replaced with "Spam"
changed
Stop shipping 32-bit Linux x86 binaries
What’s Fixed
fixed
'Save All' attachments with same names overwrote existing files without warning
fixed
Message headers were re-downloaded at every startup
fixed
Could not drag and drop ICS file to Today Pane
fixed
'Show remote content' did not display remote content for EML message
fixed
Emoji sequences were not properly handled in subject lines
fixed
Unified toolbar Spam button did not switch to "Not Spam" when spam message selected
fixed
Upgrading Thunderbird hid the Menu bar
fixed
When configuring external GnuPG, user was not promted to import public key
fixed
Message compose window could incorrectly disappear from Task Bar on Windows
fixed
Add-on account creation did not work with Account Hub
fixed
Owl install did not show link to website in Account Hub
fixed
Username field did not appear in Account Hub when exchange authentication failed
fixed
Disabled inputs could be toggled in Account Hub address book
fixed
Manual account setup in Account Hub defaulted Connection Security to None
fixed
Close button from Account Hub was not narrated
fixed
Account Hub email creation error notifications were not narrated
fixed
Users could not disable spinning overlay in Account Hub for email
fixed
Deleted account data remained in "Export to mobile device" menu
fixed
'Sent' and 'Spam' folders were not always created when setting up new IMAP accounts
fixed
Some third-party hosted accounts could not be created in Account Hub
fixed
Account Hub allowed keyboard shortcuts to be executed in background screen
fixed
Spam was not checked with mail.server.default.check_all_folders_for_new on
fixed
Upgrade from 128.x->140.x broke authentication for @att.net using Yahoo backend
fixed
Task reminders could fail for tasks without end dates or with shifted due dates
fixed
Visual and UX improvements
fixed
Security fixes

What’s Changed
changed
Flatpak runtime has been updated to Freedesktop SDK 24.08
What’s Fixed
fixed
Copying text from some error alerts was not possible
fixed
Fastmail CalDAV app password access failed due to forced OAuth regression
fixed
Delete key failed to prevent deleting attachments in OpenPGP messages
fixed
Newly created folder was missing under "Recent" when moving a message
fixed
Sender avatar displayed incorrectly for 'Name' via address sender format
fixed
Sorting by threads only brought threads with unread top messages to the top
fixed
News message marked read after NNTP error prevented retrieval from server
fixed
Inbox 'Location' column was not translated in French locale installation
fixed
Not all headers were signed when creating digitally signed OpenPGP email
fixed
Users could not read mail signed with OpenPGP v6 and PQC keys
fixed
Testing a configured personal S/MIME certificate for a sub-identity did not work
fixed
Testing an S/MIME certificate did not work for an old invalid certificate
fixed
Changing identity in compose window caused modified draft not to be saved
fixed
Shift-click 'Compose Message To' on 'mailto' link did not open in plain text
fixed
Image preview in Insert Image dialog failed with CSP error for web resources
fixed
Thunderbird could crash in various scenarios
fixed
'Copy Message to' action in a newsgroup filter did not work
fixed
Thunderbird could not import profile located at the top level of zip file
fixed
Thunderbird did not clearly fail when importing profile from a bad source
fixed
No way to distinguish between Thunderbird Release/ESR in Windows registry
fixed
Multi-attachment delete/detach confirmation only cited first attachment
fixed
Thunderbird hung when auto-checking multiple accounts for new messages
fixed
Reply All button was missing when using a Microsoft Exchange account
fixed
Sending emails via servers with self-signed certificate did not work
fixed
Task reminders could fail for tasks without end dates or with shifted due dates
fixed
Could not copy an event in multiweek or month view by drag-and-drop
fixed
Calendar discovery with certificate error displayed multiple exceptions
fixed
Visual and UX improvements
fixed
Security fixes

What’s Fixed
fixed
Thunderbird could crash on startup

What’s Fixed
fixed
Web pages with bad certificates displayed as blank
fixed
Users could no longer send using smtp-relay.gmail.com
fixed
Changing to new drafts folder and then back did not correctly restore the folder
fixed
Option did not exist to create new address book under File -> New
fixed
Some folders showed new mail count prior to receiving mail
fixed
Menu bar was hidden after updating from 128esr to 140esr
fixed
Menu Bar -> View contained duplicate accelerator keys
fixed
Warning was not logged if mail.openpgp.alias_rules_file file did not exist
fixed
Cmd+Shift+F no longer invoked "Search Messages" on macOS
fixed
Arrow key selection in global search bar skipped every other result
fixed
Drag-drop of unselected contact inserted wrong or no email address
fixed
Thunderbird could crash on startup
fixed
Adding an account could fail and cause UI hang
fixed
Thunderbird could crash when importing mail
fixed
Windows new message notification click did not bring Thunderbird to foreground
fixed
Delete or detach attachments did not work for some IMAP servers
fixed
Saving a new draft retained superceded version
fixed
Language field in settings was empty after restart in Troubleshoot Mode
fixed
Visual and UX improvements
fixed
Security fixes

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
Folder copy enabled within mail server accounts and local folders
new
'Reset Folder Order' option added to folder pane to reset custom folder sorting
What’s Changed
changed
'Copy Message Location' removed from mail context menu
What’s Fixed
fixed
Users with attachments open in tabs saw an error on Thunderbird restart
fixed
Notification sounds did not respect operating system's do-not-disturb mode
fixed
Non-English localized Thunderbird created English special folders on first start
fixed
Users were unable to use Fastmail calendars due to missing OAuth settings
fixed
Sending from unified or local folder failed if no default account was set
fixed
Right-clicking 'List-ID' -> 'Unsubscribe' created double encoded draft subject
fixed
On Linux, the close caption button was inactive when mouse was in screen corner
fixed
Toggling dark message mode did not restore focus and scroll position
fixed
Message list scrolled back when returning to mail tab after opening a message
fixed
Deleting a single message in folder using 'Group by Sort' failed after CTRL+A
fixed
New newsgroups were not added in alphabetical order by default
fixed
After updating to version 142, all newsgroup folders were sorted alphabetically
fixed
With Thunderbird closed, clicking a 'mailto:' link to send signed message failed
fixed
Replying could fail with mailnews.reply_quoting_selection.multi_word set false
fixed
Multiple saves while using 'Options' -> 'Send a Copy' resulted in multiple copies
fixed
Thunderbird did not display contact photos in WebP format from CardDAV servers
fixed
Installations from Microsoft Store did not open when clicking 'mailto:' links
fixed
Clicking the backspace icon in the quick filter field cleared the input field
fixed
Initial launch had long load times and UI lag while messages downloaded
fixed
'Mark' -> 'All Read' affected newsgroup messages that had not been fetched yet
fixed
Thunderbird could not reconnect to newsgroups after connection loss until restarted
fixed
Sending a newsgroup post appeared successful when it had actually failed
fixed
Archived RSS feed messages were sent to the archive folder of default identity
fixed
Opening Website header link in RSS feed incorrectly re-encoded URL parameters
fixed
Visual and UX improvements
fixed
Security fixes

What’s New
new
Added 'Archive' action to mail notifications
new
Composer now shows a warning if user's configured OpenPGP key expires soon
What’s Fixed
fixed
Thunderbird could crash when parsing message state
fixed
The English string for the Angry emoji was incorrectly named as the Yell emoji
fixed
Incorrect roaming data directory caused regression on Windows and macOS
fixed
Message archive folder creation could silently stop during async folder creation
fixed
Folder compaction could fail to complete due to folder write errors
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
'Search Messages...' dialog could not be opened outside the email tab
fixed
Creating an event or task from mail failed if the mail was opened in a tab
fixed
NNTP message pane did not show network error page when network was lost
fixed
Delete button could remove attachment instead of message
fixed
Folders sorted incorrectly when manually ordering them
fixed
New folders were not added alphabetically if folders manually reordered beforehand
fixed
'Any Number' was unavailable in address book search with 'Match all of the following'
fixed
Contact was not found in Advanced Address Book Search if phone number had a period
fixed
Thunderbird could crash on startup for POP3
fixed
'news:' URIs without specific server had incorrect format displayed in status bar
fixed
Enterprise policy use was not indicated in about:preferences with a link to about:policies
fixed
Visual and UX improvements
fixed
Security fixes
Known Issues
unresolved
Passwords are not remembered in 32-bit MAPI use without a compose window

What’s Fixed
fixed
Inserting a link into an HTML mail did not work as expected
Known Issues
unresolved
Passwords are not remembered in 32-bit MAPI use without a compose window

What’s New
new
Added 'Mark as Spam' and 'Mark as Starred' actions to mail notifications
new
Account Hub enabled by default for second email setup
What’s Changed
changed
Some generic appearance settings were moved from General to Appearance section
What’s Fixed
fixed
Folder cache entries were not cleared when an account was removed
fixed
Selecting a folder could fail due to an underlying error
fixed
Thunderbird could crash when copying a local folder to IMAP
fixed
"File > Save As > Template" and "Reply With Template" filter actions failed
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
List-ID contents could be selected but not copied via context menu
fixed
Some webpage links could be forced to open in Thunderbird
fixed
Thunderbird could crash when scrolling folders using up/down arrow keys
fixed
"Secret Key ID" field did not sanitize input, causing draft encryption to fail
fixed
Could not send signed/encrypted messages in some setups due to regression
fixed
Repaired folders were not reindexed for search after repair
fixed
Messages with multiple authors or no author were not indexed for global search
fixed
Messages from authors without email address were not indexed for global search
fixed
Creating a link from selected text did not work with advanced properties selected
fixed
Spellcheck no longer highlighted misspelled words in the compose window
fixed
macOS system notifications worked but email alerts could not be disabled separately
fixed
Setting different archiving options for multiple identities did not work
fixed
Thunderbird could crash in debug build when adding a news account
fixed
Moving back in the calendar import dialog could break the Continue button
fixed
Add-ons: Optional permission prompts for WebExtensions displayed wrong permissions
fixed
Density and Font Size menu item buttons used incorrect icons
fixed
Auto-unsubscribed dialog was intrusive, reappeared, and could not be ignored
fixed
Thunderbird could show a misleading error message on IMAP login failure
fixed
Modal alerts shown for expired articles when downloading news for offline use
fixed
Status bar message did not include newsgroup name along with the account name
fixed
Reconnecting to an NNTP server was potentially not possible
fixed
"About" dialog incorrectly displayed "Daily" rather than "Beta"
fixed
Links in calendar event description were unreadable in dark mode
fixed
Clicking a 'mid:' link in event created from message did not work
fixed
Unable to subscribe to more than one network calendar
fixed
Visual and UX improvements
fixed
Security fixes
Known Issues
unresolved
Passwords are not remembered in 32-bit MAPI use without a compose window

What’s Fixed
fixed
Security fixes

What’s Fixed
fixed
Thunderbird could crash when copying a local folder to IMAP
fixed
Upgrade to 139.0 incorrectly switched Table View to Cards View

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

What’s Fixed
fixed
Messages could not be viewed if the profile used a UNC path
fixed
Standalone message windows/tabs no longer responded after folder compaction
fixed
Compacting folders with certain pending operations caused unnecessary warnings
fixed
Security fixes

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

What’s Fixed
fixed
Thunderbird could crash on startup when creating Linux system tray icon
fixed
Security fixes

What’s Changed
changed
File names are now used when storing mail folders (Windows only).
changed
Disable Linux system tray icon until it gains functionality
What’s Fixed
fixed
In-app notifications did not display correctly in high contrast mode.
fixed
Repair folder did not fix mbox files produced on MacOS before Thunderbird 1.0.
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
In RSS feeds, the space bar did not scroll the message like it did in emails.
fixed
Slow performance opening an .eml file in a profile with many folders.
fixed
Threaded search view was not updated correctly when sorted by date received.
fixed
Line spacing changed unexpectedly in the message list with the default font size.
fixed
Saved message list selection was discarded when user made a new selection.
fixed
Replying from local or unified folders failed when the message pane was hidden.
fixed
Message security panel strings were used in the wrong places.
fixed
Importing an OpenPGP public key with whitespace failed.
fixed
Unable to open attached signed OpenPGP .eml message.
fixed
Right-clicking "Decrypt and Save As..." on an attachment file failed.
fixed
Searching during shutdown could cause crash.
fixed
Failed news message sending could close the compose window unexpectedly.
fixed
Having a corrupt address book database prevented sending mail.
fixed
Forwarding messages as attachments could use the wrong MIME type.
fixed
Two-factor auth via text or email did not work with Office 365 using Oauth2.
fixed
Account settings menu could be loaded twice.
fixed
No gap existed between Back and Forward buttons in the Feed Account Wizard dialog.
fixed
Thunderbird could crash when importing mail
fixed
Unable to auto-discover Address Book on Radicale server.
fixed
Mark-Of-The-Web was not applied to attachments saved via drag and drop.
fixed
Some messages could not be scrolled due to hidden overflows in inline styles.
fixed
Clicking a 'mid:' link could clear the thread pane and cause errors.
fixed
Performance regressed when moving/copying messages on Windows.
fixed
Automatic compact did not attempt to compact all folders when error encountered.
fixed
Slow performance when moving bulk messages from IMAP to local.
fixed
Crossposting news article was not possible if newsgroups on different servers.
fixed
IRC channel was not visible after restart.
fixed
Unable to view full certificate chain from the "View Signature" button.
fixed
Visual and UX improvements
fixed
Security fixes

What’s Fixed
fixed
Thunderbird could crash during shutdown if a search was still active
fixed
Failed news message send could close the compose window unexpectedly

What’s New
new
Messages are automatically adapted to dark mode with a quick toggle in the header.
new
New "Appearance" Settings UI to globally control message threading/sorting order.
What’s Changed
changed
Criteria for closing idle message databases.
What’s Fixed
fixed
Thunderbird Release channel was not displayed in "About Thunderbird".
fixed
Crash could occur when shutting down during MAPI send.
fixed
The error message for compacting a corrupted local folder was not useful.
fixed
Deleting or detaching attachments in a saved .eml file appeared to work but failed.
fixed
On HiDPI screens, clicking addresses in the header could show popup off-screen.
fixed
Opening an .EML file in profiles with many folders could take a long time.
fixed
Some messages may have been threaded incorrectly in unified folders.
fixed
Unified folders could become unusable instead of being automatically rebuilt.
fixed
Folders at level 3+ were not auto-discovered when IMAP subscriptions were ignored.
fixed
New subfolder did not inherit parent view, sort order, sort type, or columns.
fixed
With "Fetch headers only" enabled, messages could not be sorted by size.
fixed
Selecting starred messages did not update immediately.
fixed
Marking a unified folder as favorite did not show it in favorite folders.
fixed
Users with many folders experienced poor performance when resizing message panes.
fixed
The UI could falsely report a message as encrypted when a null cipher was used.
fixed
Search messages dialog list could not be sorted by clicking the header icon.
fixed
Sending to multiple SMTPs could fail silently due to missing address book.
fixed
"Replace" button in compose window was overwritten when the window was narrow.
fixed
Changing the UI font size did not apply to some dialogs.
fixed
Deleted Gmail messages stayed visible until compact/expunge, despite settings.
fixed
Export to mobile did not work when "Use default server" was selected.
fixed
Account settings menu could be loaded twice.
fixed
Account Settings updated font size were not reflected in the content frame.
fixed
Add-ons: Context menu entries were incorrectly aligned.
fixed
Middle-click autoscroll cursor appeared without arrows instead of expected design.
fixed
Some functionality was missing for newsgroup messages opened from a file or URI.
fixed
Notifications for new mail were not showing for IMAP.
fixed
Message and folder lists could display incorrect line spacing after restart.
fixed
Clicking a 'mid:' link could clear the thread pane and cause errors.
fixed
Release channel incorrectly showed What's New page after update.
fixed
"Save Link As" was not working in feed web content.
fixed
Sort indicators were missing on the calendar events list.
fixed
Visual and UX improvements
fixed
Security fixes

What’s Fixed

fixed
After starting Thunderbird, the message list position was sometimes set to an incorrect position

fixed
Security fixes

What’s Fixed

fixed
Annual Thunderbird Beta appeal intended for Thunderbird 115.12.0 did not open as expected

What’s Fixed

fixed
POP error messages from server were not displayed

fixed
Some OpenPGP messages were incorrectly reported as being partially signed or encrypted

fixed
Autocrypt header was missing from some encrypted messages due to case-sensitive email address matching

fixed
"Convert to Table" dialog content was formatted incorrectly

fixed
Opening Theme Settings reverted the current theme to the startup theme

fixed
Security fixes

Fixes
Splitter arrow between task list and task description did not behave as expected
Calendar Event Attendees dialog had incorrectly sized rows
Security fixes

Changes
Update channel for Thunderbird 115 is now esr.

Fixes
Thunderbird processes did not exit cleanly; user intervention was required via task manager

Known Issues
After changing password on an IMAP account, the account could become locked due to too many failed login attempts

Fixes
Creating a tag in General Settings with a number as the tag name did not work
Quick Filter button selections did not persist after restart
Collapsing and expanding message list headers sometimes caused header to scroll out of view
Single message with no children inside a parent thread sometimes displayed incorrectly as a thread with a duplicate of itself as its child
"Get selected messages" menu items did not work
"Download and Sync Messages" dialog was too short when using Russian locale, obscuring OK button
After changing password on an IMAP account, the account could become locked due to too many failed login attempts
Retrieving multiline POP3 message from server failed if message chunk ended in newline instead of carriage return and newline
IMAP, POP3, and SMTP Exchange autoconfiguration did not support encryption configuration
Non-empty address book search bar interfered with displaying/editing contacts
Deleting attendees from "Invite Attendees" view removed attendees from view, but not from invite
Splitter arrow between task list and task description did not behave as expected
Performance improvements and code cleanup
Security fixes

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

Fixes
Settings: Updating tags failed if Automatic Updates were disabled
Size of collapsed folders in folder pane did not include size of subfolders
Reversing sort order of Grouped By views in quick search did not reverse
Removing threaded messages in a unified folder sometimes resulted in an incorrect number of levels in the thread
Thread collapsing did not behave correctly when copying thread messages in multi-folder view
S/MIME encryption failed to encrypt if unsupported certificate type was encountered
Decrypting a copy of an S/MIME encrypted, opaque-signed message created an unreadable message
Thunderbird sometimes changed the subject of messages selected while simultaneously decrypting a large PGP-encrypted message
"Quote message" menu item in compose window did not work when replying to message opened in separate tab
Toolbar customization window contents overflowed the window width
Security fixes

What’s New
Added option to show packet dump when OpenPGP fails to decrypt

Fixes
Thunderbird slowed down significantly when opening email files (.eml)
Inbox view intermittently reverted to default view after moving or deleting messages
Size of collapsed folders in folder pane did not include size of subfolders
Hovering over folder does not always expand subfolders
Switching to thread pane of a folder using keyboard navigation did not focus top message
Clicking "Sent unsent messages" in Outbox context menu while in offline mode did not prompt user to go online
Mail tab-specific Unified Toolbar buttons received focus incorrectly
Quick Filter settings did not persist when Quick Filter bar was turned off
Quick Filters were unusually slow
OpenPGP Key Manager filtering did not work
OpenPGP sometimes attempted to decrypt message with incorrect key
Autoconfig failed on servers that did not support OAuth2
Opening different attachments with the same name in different messages could cause attachment files to become conflated
Overflowed attachment list could not be scrolled
Passwords disappeared from password manager list after applying and clearing filters
Cookies in cookie manager list disappeared after applying and then clearing filters
Security fixes

• new Thunderbird will now display a message when an upgrade migration task is taking a long time to complete
• new es-MX localized build now available
• new What's new link displayed in About: dialog
• new Profile Import/Export UI refreshed and moved to a tab
• new Commandline tools now included for OpenPGP debugging
• new Thunderbird may now be built with OpenPGP support and a system librnp
• new Added menu option to permanently decrypt OpenPGP encrypted messages to a folder
• new OpenPGP: Public keys from email attachments and autocrypt headers now cached for future use
• new Expired OpenPGP recipient keys now indicated in compose window
• new OpenPGP Key Assistant enabled by default
• new OpenPGP Key Properties now supports refreshing keys from key server
• new Spaces vertical toolbar for easier in-app navigation
• new Compose toolbar button for OpenPGP & S/MIME signing available via "Customize Toolbar"
• new "Select all addresses" now supported from composer pill context menu
• new Multiple active spelling dictionaries now supported in compose window
• new Add dictionaries item added to Spelling button in compose window
• new Added config option to more aggressively warn sender about having many public recipients to an email (mail.compose.warn_public_recipients.aggressive)
• new Exporting current profile now supported on importing tab
• new Back/Forward keyboard shortcuts added to Addon Manager
• new New Address Book UI and significant backend overhaul
• new Importing sqlite address books now supported
• new Importing addressbooks via CSV file now supports semi-colon (;) delimited files
• new Opening a news:// URL now works if an account is not configured for that news server
• new Google Talk chat accounts now support logging in with OAuth2
• new Matrix chat support enabled by default. This is a beta feature.
• new Printing using the system dialog without preview now supported; Set print.prefer_system_dialog to true
• new Removing events from a calendar now prompts for confirmation
• new Upcoming events in the Today Pane show how far away they are
• new Icons now displayed on recurring events and modified events within a recurring series
• changed SMTP client will now ignore socket errors after QUIT command is sen
• changed Javascript POP implementation enabled by default
• changed Buttons on "Update Failed" popup now open Beta and Release specific pages on Thunderbird website
• changed Replace "About Junk Mail" dialog with a link to the support page
• changed [macOS] Account settings moved to application menu
• changed New profiles will default to using "Threaded" message view
• changed "Discover OpenPGP Key" context menu item is no longer displayed when a key is already available
• changed Duplicated OpenPGP encrypted attachments were shown when display-attachments-inline was enabled
• changed Replaced Security compose toolbar button with Encryption toggle and Encryption options buttons
• changed OpenPGP dialog for key "acceptance per email" now displayed in more circumstances
• changed OpenPGP Key Manager dialog layout improvements
• changed Writing OpenPGP keyring data will block Thunderbird shutdown to prevent data loss
• changed When automatically attaching OpenPGP keys to emails, Thunderbird will strip key certificates
• changed A notification bar in the compose window will be displayed if encryption is possible but not enabled
• changed Inline attachment filenames now sent without data-uri encoding
• changed Per-recipient and per-domain email format preferences removed; Sending options moved to Compose Settings
• changed Thunderbird can now be used without setting up a mail account
• changed NNTP account set up moved to its own wizard; "Other accounts" wizard removed
• changed Account Manager UI updated
• changed Email account provisioner moved to a tab
• changed Link to create a new email address in Account Setup now hidden if "Email address" contains a value
• changed Addon Search will no longer display addons 

• Fixed various security fixes

• changed A warning is now displayed if an OpenPGP key has unsafe attributes that are ignored; See support article.
• fixed OpenPGP integration in Thunderbird 91.8.0 and 91.8.1 did not allow SHA-1 key signatures
• fixed macOS disk image graphics updated
• fixed CalDAV calendars were marked read-only on startup
• fixed Task creation field on macOS incorrectly displayed a search icon
• fixed Various security fixes

• fixed CLIENTID extension to SMTP was not supported by smtp-js
• fixed Additional SMTP errors now propagated to user
• fixed OpenPGP was not able to use some previously supported key types
• fixed OpenPGP Key Manager did not always display correct information after importing additional IDs
• fixed Duplicate new mail notifications could be displayed when server-side filters were in use
• fixed Cancelling an SMTP password entry resulted in multiple failure dialogs being displayed

Changes
• Thunderbird will use the first occurrence of headers that should only appear once

Fixes
• Auto-complete incorrectly changed a pasted email address to the primary address of a contact
• Attachments with filename extensions that were not registered in MIME types could not be opened
• Copy/Cut/Paste actions not working in Thunderbird Preferences
• Improved screen reader support of displayed message headers
• Various security fixes

Changes
- Thunderbird will use the first occurrence of headers that should only appear once

Fixes
- Auto-complete incorrectly changed a pasted email address to the primary address of a contact
- Attachments with filename extensions that were not registered in MIME types could not be opened
- Copy/Cut/Paste actions not working in Thunderbird Preferences
- Improved screen reader support of displayed message headers
- Various security fixes

Changed
• Thunderbird generated views of meeting invitations are now expanded by default
Fixes
• Emails were not downloading at startup under some conditions
• Port numbers were not shown in "Confirm Security Exception" dialog for CalDAV connections
• Various security fixes

What’s New
• Thunderbird will now offer to send large forwarded attachments via FileLink

Fixes
• Partially signed unencrypted messages displayed an incorrect "partially encrypted" notification
• Attachments filenames were not sanitized before saving to disk
• In the attachment bar, the "Import OpenPGP Key" item displayed for public keys displayed an error and did not import the key
• "Open with" attachment dialog did not have a selected radio button option
• Various security fixes

Fixes
• fixed: JS LDAP implementation did not support self-signed SSL certificates
• fixed: After saving a draft and subsequently sending a FileLink email, the original file was removed from disk
• fixed: Chat OTR encryption did not work
• fixed: OTR verification bar was not removed after completing verification
• fixed: Various theme improvements