For those of us receiving email in multiple languages, it would be awesome to have #Firefox Translate built in to Thunderbird. No sending your sensitive conversations to a corporate cloud, just a lean translation service running locally.
We've decided to make it a development priority for Q1 2024!
You'll be able to track the progress via this bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1823007
But as always, we'll also keep you posted right here.