CCleaner

What's new in this version:

New:
- Thunderbird will now display a message when an upgrade migration task is taking a long time to complete
- es-MX localized build now available
- What's link displayed in About: dialog
- Profile Import/Export UI refreshed and moved to a tab
- Commandline tools now included for OpenPGP debugging
- Thunderbird may now be built with OpenPGP support and a system librnp
- Added menu option to permanently decrypt OpenPGP encrypted messages to a folder
- OpenPGP: Public keys from email attachments and autocrypt headers now cached for future use
- Expired OpenPGP recipient keys now indicated in compose window
- OpenPGP Key Assistant enabled by default
- OpenPGP Key Properties now supports refreshing keys from key server
- Spaces vertical toolbar for easier in-app navigation
- Compose toolbar button for OpenPGP & S/MIME signing available via "Customize Toolbar"
- "Select all addresses" now supported from composer pill context menu
- Multiple active spelling dictionaries now supported in compose window
- Add dictionaries item added to Spelling button in compose window
- Added config option to more aggressively warn sender about having many public recipients to an email (mail.compose.warn_public_recipients.aggressive)
- Exporting current profile now supported on importing tab
- Back/Forward keyboard shortcuts added to Addon Manager
- Address Book UI and significant backend overhaul
- Importing sqlite address books now supported
- Importing addressbooks via CSV file now supports semi-colon (;) delimited files
- Opening a s:// URL now works if an account is not configured for that s server
- Google Talk chat accounts now support logging in with OAuth2
- Matrix chat support enabled by default. This is a beta feature.
- Printing using the system dialog without preview now supported; Set print.prefer_system_dialog to true
- Removing events from a calendar now prompts for confirmation
- Upcoming events in the Today Pane show how far away they are
- 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
- Javascript POP implementation enabled by default
- Buttons on "Update Failed" popup now open Beta and Release specific pages on Thunderbird website
- Replace "About Junk Mail" dialog with a link to the support page
- macOS] Account settings moved to application menu
- profiles will default to using "Threaded" message view
- "Discover OpenPGP Key" context menu item is no longer displayed when a key is already available
- Duplicated OpenPGP encrypted attachments were shown when display-attachments-inline was enabled
- Replaced Security compose toolbar button with Encryption toggle and Encryption options buttons
- OpenPGP dialog for key "acceptance per email" now displayed in more circumstances
- OpenPGP Key Manager dialog layout improvements
- Writing OpenPGP keyring data will block Thunderbird shutdown to prevent data loss
- When automatically attaching OpenPGP keys to emails, Thunderbird will strip key certificates
- A notification bar in the compose window will be displayed if encryption is possible but not enabled
- Inline attachment filenames now sent without data-uri encoding
- Per-recipient and per-domain email format preferences removed; Sending options moved to Compose Settings
- Thunderbird can now be used without setting up a mail account
- NNTP account set up moved to its own wizard; "Other accounts" wizard removed
- Account Manager UI updated
- Email account provisioner moved to a tab
- Link to create a email address in Account Setup now hidden if "Email address" contains a value
- Addon Search will no longer display addons that are incompatible
- Searching from the Themes page of Addon Manager will now limit search results to only include themes
- Additional fields for download limits, expiration, and password protection added to FileLink template
- FileLink will check the provider for sufficient space before uploading
- "PreferMailFormat" property removed from addressbook
- Address book contact data is now stored in the vCard format. The change isn't backwards-compatible; backups are stored in the profile directory.
- Default install directory for Thunderbird Beta to not conflict with release versions
- Tab icons updated
- Message Header toolbar buttons will not display a border when set to show icons only
- message detection for non-INBOX IMAP folders improved
- Javascript NNTP implementation enabled by default; Set mails.nntp.jsmodule to false to disable
- Preference for OTR encrypted conversation logging moved to Protocol settings
- Thunderbird will not try to use OTR Chat encryption if the protocol supports native encryption
- Invitations to IRC and XMPP chat rooms will now prompt the user if they would like to join
- Today Pane UI refreshed
- Thunderbird will not support "Secondly" or "Minutely" recurring calendar events
- Default action of Edit button in recurring event dialog to display submenu
- Support for importing and exporting calendars from Outlook CSV format was removed
- Thunderbird will now delay refreshing cached calendars at start-up
- Javascript Ical parser (ical.js) enabled by default

Fixed:
- Opening "cid:" links failed
- Message download progress was calculated incorrectly
- Ctrl+mouse wheel did not zoom in the message source window
- Open message in containing folder did not work for standalone windows
- Multi-message view was not fully scrollable
- Messages did not reload in all open windows after Junk status was
- Detached attachments were opened from a temporary copy instead of the selected save location
- IMAP folder subscription changes on servers using OAuth2 authentication were not reflected in folder pane until Thunderbird was restarted
- Improved error reporting for external GnuPG configurations
- Incorrect OpenPGP preferences were used for secondary identities
- Adding an expiry date to an OpenPGP key that did not have one was not possible
- UI showed old OpenPGP key expiry date after changing it
- Importing large OpenPGP key files failed
- OpenPGP "Repair Message" button did not work with some emails
- Importing OpenPGP public keys without a blank line following the header failed
- Dragging and dropping multiple email attachments between windows did not always copy all attachments
- Attachment bar in message compose window was not keyboard accessible
- Triggering recipient pill creation in the compose window incorrectly used the entire field as input
- Compose notification bars were not easily accessible via keyboard
- "Save message" confirmation dialog buttons were not navigable using arrow keys
- Focus jumped in compose window when closing the contacts sidebar
- Save dialog was incorrectly shown when closing empty composer windows
- Incorrect access key used for File->->Message menu item
- Changing focus in the compose window with multiple recipient pills selected did not always deselect the pills
- Sending a message with non-ascii characters in recipient local parts failed unexpectedly when the server did not support SMTPUTF8
- LDAP Autoconfig could block Thunderbird startup
- Improvements to the Import/Export feature
- Configuring multiple SMTP accounts using the same server was not possible
- Empty Trash on Exit did not work with IMAP accounts using OAuth2 authentication
- IMAP server hostname changes were not reflected in Folder Properties dialog
- Addons automatically updated when Thunderbird updated despite Addon updates being turned off
- Message size calculations incorrectly included FileLink attachments
- After converting a FileLink attachment back to an e-mail attachment, the privacy notification persisted
- A failed FileLink provider change removed the attachment completely
- Subscribing to CardDAV address books from Account Setup tab did not subscribe to all selected address books
- Adding CardDAV address books failed if an addon-provided address book was present
- Messages with Message-Id headers longer than 332 characters could not be forwarded
- SMTP send progress bar could trigger high CPU usage when the server connection failed
- Improved POP server authentication detection during Account Setup
- s folders did not display biff indicator
- IMAP flag changes from another client were not seen after some inactivity
- Recipients were not de-duplicated before sending, leading to sending errors
- Chat conversations' context menu did not recognize links
- Chat username splitting in the account wizard did not work after changing protocols
- Removing obsolete proprietary chat accounts did not work
- OTR encrypted chat did not work on FreeBSD
- Event edit toolbar button was not disabled when an invitation was selected
- Event view headers and content were not lined up consistently for RTL locales
- Mini-month views did not properly update at midnight
- Some labels in Calendar were displayed in multiple languages
- Thunderbird permitted inline editing of read-only event titles
- Calendar view reloaded when switching tabs
- It was possible to create annual calendar events with invalid days
- Detection of attached vCalendar files improved
- Reminders for events created by another user could not be closed
- MS Teams meeting event descriptions were unreadable when stored on Google Calendar
- Adding a Google calendar with a non-gmail or googlemail e-mail address failed
- Accepting a recurrence exception to an event accepted event associated with the original recurring event rather than the exception
- Various security fixes