Der kostenlose Mailclient für Windows, macOS und Linux Thunderbird ist in Version 102.6.1 erschienen.

Thunderbird 102.6.1 Release Notes

FIXED

• Remote content did not load in user-defined signatures
• Addons that added new action buttons were not shown for addon upgrades, requiring removal and reinstall
• Various stability improvements

Quelle: https://www.thunderbird.net/en-US/thunderbird/102.6.1/releasenotes/