Thunderbird 78.4.0


Thunderbird is a free, open-source, cross-platform application for managing email and news feeds. It is a local (rather than a web-based) email application that is powerful yet easy-to-use. Thunderbird is developed, tested, translated and supported by the folks at Mozilla Corporation and by a group of dedicated volunteers. Thunderbird gives you control and ownership over your email. There are lots of add-ons available for Thunderbird that enable you to extend and customize your email experience.

Thunderbird gives you IMAP/POP support, a built-in RSS reader, support for HTML mail, powerful quick search, saved search folders, advanced message filtering, message grouping, labels, return receipts, smart address book LDAP address completion, import tools, and the ability to manage multiple e-mail and newsgroup accounts.

What's new in Thunderbird 78.4.0:

  • MailExtensions: browser.tabs.sendMessage API added

  • MailExtensions: messageDisplayScripts API added


  • Yahoo and AOL mail users using password authentication will be migrated to OAuth2
  • MailExtensions: messageDisplay APIs extended to support multiple selected messages
  • MailExtensions: compose.begin functions now support creating a message with attachments


  • Thunderbird could freeze when updating global search index
  • Multiple issues with handling of self-signed SSL certificates addressed
  • Recipient address fields in compose window could expand to fill all available space
  • Inserting emoji characters in message compose window caused unexpected behavior
  • Button to restore default folder icon color was not keyboard accessible
  • Various keyboard navigation fixes
  • Various color-related theme fixes
  • MailExtensions: Updating attachments with onBeforeSend.addListener() did not work

Download: Thunderbird 78.4.0 for Windows (EN/US) | 64-bit | ~35.0 MB (Open Source)
Download: Thunderbird 78.4.0 for Linux (EN/US) | 55.5 MB
Download: Thunderbird 78.4.0 for Mac OS (EN/US) | 66.4 MB
Download: Thunderbird 78.4.0 in other languages
View: Thunderbird Website | Release Notes | Screenshot

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