από τον Onno Ekker (δημιουργός) στις Ιούλ. 23, 2012 · μόνιμος σύνδεσμος

As stated in the developer comments: I didn't invent the feature to forward inline. It's a standard feature of Thunderbird to forward a single message inline.Bug 401479 is a feature request to add an option to forward inline multiple messages as a single e-mail. Maybe you can add your comments there and vote for that bug if you want that feature added to Thunderbird.
https://bugzilla.mozilla.org/show_bug.cgi?id=401479