Download Mozilla Thunderbird 91.1.0

The Mozilla Foundation has released version 91.1.0 of Thunderbird. Thunderbird is an open source email and newsgroup client, with features such as support for several mail and news accounts, a spam filter, spell checker, and a customizable look and feel. In version 91 has included a warning when an email is sent to a possibly non-existent address, or when there are too many addresses on the public address line. There is also support for CardDAV and there is a native client for a Mac equipped with an Apple Silicon processor.

At the moment it is not yet possible to do an automatic update from version 78 to 91. An existing installation can be updated by manually downloading and running the installation file. This automatic migration will be added in a future version. The following changes and improvements have also been made in this release:

changes

• VCard attachments now sent with “text/vcard” instead of “text/x-vcard”

Fixes

• Thunderbird registered Accessibility Handlers using same GUIDs as Firefox, causing performance issues for NVDA users
• Focus lost when reordering accounts by keyboard in the Account Manager
• Account setup did not use provider display name for setting up calendars
• Various theme and UX fixes
• Various security fixes