Comment # 6 on bug 900825 from Wolfgang Rosenauer

(In reply to Hrvoje Senjan from comment #5)
> isn't this standard Firefox dialog? i mean really standard, neither KDE nor
> GNOME (i.e. when Ui.allow_platform_file_picker is false)

Indeed! I almost forgot it still exists.
It really should only come up if the above setting is false.
Grant, can you please check.