The folder pane in Thunderbird used to have a left and right arrow that allowed switching between the folders displayed. However, since a week or so, the arrows are gone (update? miss-clicked something?)
As I use them several times a day: how can I get the arrows back? I have Thunderbird 8.0.
Note: I know, switching is also accessible via the menu bar > View > Folders, but this is too much clicks for me.