Yettwasezmel 5 ɣef 5 n yetran

sɛur m-fr1 di June 15, 2012 · aseɣwen yezgan

Works fine in TB 14Beta, if one will add in userChrome.css :

#msgHeaderView, #msgHeaderViewDeck {
max-height: 450px !important;
}

where max-height should be adjusted to your own requirements!