Thunderbird 140 'Eclipse' is the latest messaging client from Mozilla subsidiary MZLA, marking the new Extended Support Release until mid-2026. This version includes significant new features while continuing to provide security updates until Thunderbird 152. It aligns with an approximately monthly release schedule like Firefox, introducing two release channels. Notable features include Dark Message Mode, refined appearance settings, enhanced account management, support for native OS notifications across supported platforms, and improved message interactions directly from notifications.
Thunderbird 140 'Eclipse' represents the new Extended Support Release, ensuring updates until mid-2026 with significant new features catering to diverse user needs.
This version introduces Dark Message Mode, consolidates appearance preferences, and enhances account management, establishing smoother interactions with the interface while leveraging native OS notifications.
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