Yettwasezmel 5 ɣef 5 n yetran

sɛur Neva di Nov. 13, 2020 · aseɣwen yezgan

As the developer Jan mentioned in a comment, replacement for Thunderbird 78.4.0 (64bit) exists and works. Available here: https://addons.thunderbird.net/de/thunderbird/addon/toggle-line-wrap/