Thunderbird Beta Notes

Version 53.0beta, first offered to Beta channel users on April 10, 2017

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.

These release notes apply to Thunderbird version 53 beta 2 released April 19th, 2017.

What’s New

  • New

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

  • Fixed

    Background images not working and other issues related to embedded images when composing email (not working in version 52.0.1)

Known Issues

  • unresolved

    Datetime formatting is not working properly on the Linux 32bit platform. This results in party broken calendar views and incorrect event times - for users on this platform it is strictly recommended to backup the user profile before updating and disable Lightning after updating for the remaining lifetime of this version to avoid damages to calendar data.

  • unresolved

    Large attachments may not be shown or saved correctly if the message is stored in an IMAP folder which is not synchronized for offline use. Workaround: Set preference browser.cache.memory.max_entry_size to the value of -1 (unlimited) and create integer preference browser.cache.memory.capacity with the value of 200000 (200 MB, 25 MB per message).

  • unresolved

    Crash due to incompatibility with McAfee Anti-SPAM add-on. Workaround: Start in safe mode and disable McAfee Anti-Spam Extension

  • unresolved

    Crash when compacting IMAP folder