Add a "Mark Message as Unread" control to Mozilla Mail&News.

"mark message as read" menu item is a toggle, hence the checkmark in the menu item if the message is read. Toggling this menu item will mark the message unread.

verified.

I would also prefer if the wording was changed to "unread". Everytime I right-click -> mark -> as read, I cringe because the verbal reading seems counter to my expectations. As I follow the menus, my thought process goes: "mark.. as read"..oh it's checked..I must uncheck it..I will uncheck this "mark as read" checkbox..done. Maybe it's a usability thing, I don't know. I think there are more people in the world tring to "mark as unread" than there are trying to "mark as read".