Thunderbird is a free and open source cross-platform email client, personal information manager, news client, RSS and chat client developed by the Mozilla Foundation. The project strategy was originally modeled on the Mozilla Firefox web browser.

On January 28, 2020, the Mozilla Foundation announced that the project will henceforth be run by a new wholly-owned subsidiary, MZLA Technologies, to explore offering products and services that were previously unattainable, collected through partnerships and non-charitable donations income.

Thunderbird 102.6 is released with the following updates:

System Requirements

• Windows: Windows 7 or higher
• Mac: macOS 10.12 or later
• Linux: GTK+ 3.14 or later

repair:

• Importing OpenPGP key fails when public key with public subkey already exists
• Message index files were incorrectly deleted when too many folders were opened
• Thunderbird sometimes incorrectly formats synced vCards
• Recurring events cannot be displayed after a certain number of repetitions
• Cookies deleted from the “Show Cookies” dialog are not actually deleted
• Suspended RSS feeds don’t really pause updates
• Various visual and UX improvements
• Fixes for various security issues
  1. CVE-2022-46878: Memory safety vulnerability fixed in Thunderbird 102.6
  2. CVE-2022-46881: Memory corruption in WebGL
  3. CVE-2022-46880: UAF issue in WebGL
  4. CVE-2022-46872: Read arbitrary files from affected content processes
  5. CVE-2022-46882: UAF issue in WebGL
  6. CVE-2022-46875: Download Protections bypassed by .atloc and .ftploc files on macOS
  7. CVE-2022-46874: Drag and Dropped Filenames may have been truncated to a malicious extension

For more details, please check: https://www.thunderbird.net/en-US/thunderbird/102.6.0/releasenotes/