Thunderbird 78.7.0 released

[German]The developers of the Thunderbird email client have released Thunderbird 78.7.0 on January 26, 2021. This is a maintenance update for the 78 main version of the email client, which fixes bugs and closes security holes.


According to the release notes, there are the following new features: 

  • 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)
  • MailExtensions: Added

In addition, there are the following changes:

  • 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

In addition, the following bug fixes were made:

  • 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

In addition, there are some closed vulnerabilities, which are documented here. Unsolved is the problem that Thunderbird runs sluggishly under macOS Big Sur.   

System requirements

The system requirements for the different operating system versions (see also):


  • Windows: Windows 7, Windows Server 2008 R2 or higher
  • Mac: Mac OS X 10.9 or higher
  • Linux: GTK+ 3.4 or higher

The download is available here. By the way, Thunderbird is free of charge.

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