Bem-vindo as Extensões para o Thunderbird.
Adicione recursos e estilos extras para tornar o Thunderbird só seu.
FecharFolder Pane Toggler 1.0
por CreakyGate
Adds a toggle button to the unified toolbar to show and hide the folder pane. This is very useful when using different tabs with different folders open, and on smaller screens, or where as much space is needed as possible. This should be part of TB