Software Update: Mozilla Thunderbird 102.3.0

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The Mozilla Foundation has released version 102.3.0 of Thunderbird. Thunderbird is an open source email and newsgroup client, with features such as support for multiple mail and news accounts, a spam filter, spell checker, and a customizable appearance. In version 102 Mozilla has refreshed the user interface and the address book, made importing and exporting user accounts easier and added the Matrix chat protocol. The following improvements have also been made in this update:


  • Thunderbird will no longer attempt to import account passwords when importing from another Thunderbird profile in order to prevent profile corruption and permanent data loss.
  • Devtools performance profile will use Thunderbird presets instead of Web Developer presets


  • Thunderbird startup performance improvements
  • Saving email source and images failed
  • Error message was shown repeatedly when temporary disk space was full
  • Attaching OpenPGP keys without a set size to non-encrypted messages briefly displayed a size of zero bytes
  • Global Search entry box initially contained “undefined”
  • Delete from POP Server mail filter rule intermittently failed to trigger
  • Connections to POP3 servers without UIDL support failed
  • Pop accounts with “Fetch headers only” set downloaded complete messages if server did not advertise TOP capability
  • “File -> New -> Address Book Contact” from Compose window did not work
  • Attach “My vCard” option in compose window was not available
  • Improved performance of matching a contact to an email address
  • Address book only recognized a contact’s first two email addresses
  • Address book search and autocomplete failed if a contact vCard could not be parsed
  • Downloading NNTP messages for offline use failed
  • NNTP client became stuck when connecting to Public-Inbox servers
  • Various visual and UX improvements
  • Various security fixes

Version number 102.3.0
Release status Final
Operating systems Windows 7, Linux, macOS, Windows 8, Windows 10, Windows 11
Website Mozilla Foundation
License type Prerequisites (GNU/BSD/etc.)
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