Yettwasezmel 5 ɣef 5 n yetran

sɛur Lindsey Smith di Dec. 18, 2009 · aseɣwen yezgan

There's a straightforward work around for this in Thunderbird 3.0 using keyconfig:
http://gerundinganimal.blogspot.com/2009/12/adding-compact-folder-button-to.html