Rated 3 out of 5 stars

Great that it should work again on TB68, but the hotkey change seems to make it unusable on OSX (no native "Alt" key; TB binds that to Option, but Option-W is already a system shortcut for alternate text entry [capital-Sigma])

Yeah, selfish decision of mine, see http://git.kiszka.org/?p=togglewordwrap.git;a=commit;h=06e80bf1e7a912328ba71e1bd62611b30dca05fe.

Good news: With TB 78.4 and https://addons.thunderbird.net/de/thunderbird/addon/toggle-line-wrap you can modify the shortcuts again (Add-ons Manager - click on gear - Manage Extension Shortcuts).