Thunderbird Release Notes

Version 60.0, first offered to channel users on

Check out "What’s New" and "Known Issues" for this version of Thunderbird below. As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla. If interested, please see the complete list of changes in this release.

Draft release notes for Thunderbird 60 ESR collecting all release notes of versions 53 beta to 60 beta which have not been uplifted to TB 52 ESR.

What’s New

  • new

    When writing a message, a delete button now allows the removal of a recipient. This delete button is displayed when hovering the To/Cc/Bcc selector.

  • new

    Further improvements to attachments handling during compose, Alt+M now allows to show the attachment pane. The attachment pane can also be shown initially when composing a new message. Right-click on the header to enable this option. It is now also impossible to completely collapse a non-empty attachment pane. That protects against attachments accidentally being sent.

  • new

    Edit Template command. This also solves various problems when saving as template (duplicates created, message ID lost).

  • new

    Thunderbird now allows the conversion of folders from mbox to maildir format and vice versa. This is an experimental feature that needs to be enabled by setting the preference mail.store_conversion_enabled.

  • new

    WebExtension themes are now enabled in Thunderbird

  • new

    Calendar: Allow copying, cutting or deleting of a selected occurrence or the entire series for recurring events

  • new

    Calendar: Provide an option to display locations for events in calendar day and week views

  • new

    Calendar: Provide the ability for sending/not sending meeting notifications directly instead of showing a popup

  • new

    When composing a message, attachments can now be reordered

  • new

    Calendar: Option to select the target calendar when pasting an event or task

  • new

    Calendar: Allow email scheduling for CalDAV servers supporting server-side scheduling

  • new

    Allow changing the Spellcheck Language from status bar display

  • new

    "New Message from Template" command

  • new

    Thunderbird Chat now contains multiple built-in message themes

  • new

    A default startup directory in the address book window can now be configured

  • new

    Individual feed update interval

  • new

    An option under "Tools > Options, Advanced, General" now allows to select whether date/time display will follow the application locale (adjusted by operating system's format settings for that locale) or the locale selected in the operating system's regional settings. In other words, an US English Thunderbird can use, for example, German formats.

  • new

    FIDO U2F support

  • changed

    IMPORTANT: Add-ons not marked as compatible with Thunderbird 60 by their authors will be disabled (this can be reverted via preference extensions.strictCompatibility)

  • changed

    Thunderbird will now prompt to compact IMAP folders even if the account is online

  • changed

    Add-on options can no longer be configured from the Add-on Manager page. A new menu item "Add-on Options" is now available on the Tools menu.

  • changed

    When customizing the From: address, Thunderbird will now use this address for the SMTP "MAIL FROM" command. Previously the address configured in the identity was used. The preference mail.smtp.useSenderForSmtpMailFrom allows return to the previous behavior.

  • changed

    During address entry, the matching part of the address is now shown in bold. Preference mail.autoComplete.commentColumn allows to display the address book where the address is stored.

  • changed

    Calendar: Removal of capability to send email invitations compatible to Outlook 2002 and earlier

  • changed

    "Edit As New Message" will now use the account's default compose format, either HTML or plain text ignoring the format of the message. Plain text messages will be converted to HTML and vice versa. Then using the modifier, the format choice will be reverted.

  • changed

    The plain text to HTML conversion has been improved where such a conversion is necessary for "Edit As New Message" or when the shift modifier is used for "Edit Draft" or "New Message from Template".

  • changed

    The "Edit Draft" command now also honors the use of the shift key to convert HTML to plain text or vice versa when editing a draft

  • changed

    Calendar: Reminders on read-only calendars can now be dismissed, while reminders for missed events will now only be displayed for writable calendars if option "Show missed reminders for writable calendars" is selected

  • changed

    When attaching a message via drag and drop, the subject of the message is now used as attachment name instead of "Attached Message"

  • changed

    On first start, Thunderbird now shows the account setup dialog, no longer the account provisioner dialog

  • changed

    Thunderbird follows Firefox' Photon design with rectangular tabs and many other theme improvements

  • changed

    Thunderbird now uses Mozilla's latest proxy technology (add-on FoxyProxy now supported)

  • changed

    IMAP: When after sending a message storing that sent message fails, the message can now be stored in a local folder

  • changed

    When messages are composed in paragraph format, "body text" and split mail quotes are converted to paragraphs when pressing the enter key

  • changed

    Thunderbird now uses the latest Mozilla technology based on Rust for encoding messages

  • changed

    Thunderbird Chat: Nicknames inside of messages are colored to match the participants list

  • changed

    Better address book photo handling: Photos can be added by drag and drop and a copy of all photos will be stored in the Thunderbird profile

  • fixed

    Various problems related to handling the IMAP trash folder: Under certain circumstances the selection of the trash folder didn't persist, for example when the name contained non-ASCII characters, or in localized versions of Thunderbird. At times unwanted additional trash folders were created. Selection of a trash folder didn't give immediate visual feedback.

  • fixed

    Shared IMAP folders not shown in subscribe dialog under some circumstances

  • fixed

    Messages moved between IMAP accounts were missing parts (embedded content or attachments) under some circumstances

  • fixed

    Improvements encoding/decoding message headers

  • fixed

    Calendar: Wrong time formatting for some time zones

  • fixed

    Text in the address book card view wasn't selectable

  • fixed

    When many Thunderbird clients or other email clients accessed the same IMAP draft folder, messages were sometimes sent with the wrong identity. This has been corrected and the user will be notified if none of their identities matches the draft.

  • fixed

    Passwords can now contain non-ASCII characters, like international characters, for example áäß, and symbols, for example €§

  • fixed

    Outlook import

  • fixed

    Localised versions of Thunderbird didn't show a localised name for Hotmail's "Deleted" folder

  • fixed

    Calendar: Can't copy information from event dialog for received invitations

  • fixed

    Contacts sidebar: Selection and context menu behavior

  • fixed

    Better error handling for Gmail authentication to avoid re-downloading of folders

Known Issues

  • unresolved

    The IMAP and News subscribe dialogue now presents a flat list of folders instead of a folder tree. This will be restored to its original form in the next release.

  • unresolved

    Source view not working for JS, XML, CSS, etc. source files via 'Developer Tools > Error Console'. Workaround: Set preference view_source.editor.external and view_source.editor.path to view the source in the editor of your choice. Alternatively, use 'Developer Tools > Developer Toolbox, Console'.