来週火曜夜から水曜朝にかけてくるはず。

Release Notes — Thunderbird
https://www.thunderbird.net/en-US/thunderbird/157.0/releasenotes/
> Version 157.0 | Released September 29, 2026

Release Notes — Thunderbird
https://www.thunderbird.net/en-US/thunderbird/153.4.0esr/releasenotes/
> Version 153.4.0esr | Released September 29, 2026

Release Notes — Thunderbird
https://www.thunderbird.net/en-US/thunderbird/140.17.0esr/releasenotes/
> Version 140.17.0esr | Released September 29, 2026