Thunderbird 78.7.0


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 78.7.0:

  • Extension API: Compose API now supports editing messages and templates as new messages

  • Extension API: composeHtml is now exposed in MailIdentity

  • Extension API: windows.update and windows.create now support titlePreface

  • Extension API: new Accounts API functions: accounts.getDefault() and accounts.getDefaultIdentity(accountId)


  • Extension API: body and plainTextBody are now used as compose mode selectors in setComposeDetails and begin* functions in Compose API
  • Theme: removed the double border around the task description field on the Tasks tab


  • Account Manager: When deleting the last remaining account, the default account was not getting cleared and still pointed to the no-longer-existing account

  • OpenPGP: Verification of an inline signed message would fail if it contained leading whitespace

  • OpenPGP: Various other minor bug and stability fixes

  • Mail Window: Quickfilter bar buttons disappear when hovered on Windows 10 High Contrast Black theme

  • Theme: folder properties dialog contained black text on a black background in dark mode

  • Theme: recipient pills in compose window were not visible in high contrast dark theme on Windows 10
  • Extension API: browserAction buttons were not restored after restart if they were moved outside the default toolbar

  • Extension API: browser.compose.beginNew could not override identity plaintext setting

  • Extension API: browser.compose.beginForward was ignoring ComposeDetails

  • Extension API: browser.compose.setComposeDetails did not properly handle Windows-style line endings

  • Various security fixes

Known issues

  • Thunderbird performs sluggishly on macOS Big Sur

Download: Thunderbird 78.7.0 for Windows (EN/US) | 64-bit | ~50.0 MB (Open Source)
Download: Thunderbird 78.7.0 for Linux (EN/US) | 65.2 MB
Download: Thunderbird 78.7.0 for Mac OS (EN/US) | 66.4 MB
Download: Thunderbird 78.7.0 in other languages
View: Thunderbird Website | Release Notes | Screenshot

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