一応公式？アナウンスは来てるのか。リリースノートはまだないw

[tb-planning] Thunderbird esr128.0 is live | Topicbox
https://thunderbird.topicbox.com/groups/planning/T2153f87c9d99b69a/tb-planning-thunderbird-esr128-0-is-live

> 128.0 is live on the website https://thunderbird.net/
> However, in product updates via Help > About are currently disabled.

で、いつものごとく更新はまだ disabled だと。