Thunderbird Release Notes

Version 52.9.0, first offered to channel users on July 3, 2018

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.

System Requirements: • Window: Windows XP, Windows Server 2003 or later • Mac: Mac OS X 10.9 or later • Linux: GTK+ 3.4 or higher Details here.

Please refer to Release Notes for version 52.0 to see the list of improvements and fixed issues.

What’s New

  • changed

    Thunderbird will now prompt to compact IMAP folders even if the account is online. Note: Under certain circumstances an incorrect estimate of the expected gain is shown.

  • fixed

    Complete fix of the EFAIL vulnerability: 1) Removing some HTML crafted to carry out an attack. 2) Optionally: Not decrypting subordinate message parts that otherwise might reveal decrypted content to the attacker. Preference mailnews.p7m_subparts_external needs to be set to true for added security.

  • fixed

    Various problems when forwarding messages inline when using "simple" HTML view

  • fixed

    Various security fixes

Known Issues

  • unresolved

    Deleting or detaching attachments will corrupt messages under certain circumstances