Comment # 5 on bug 900825 from Hrvoje Senjan

(In reply to Wolfgang Rosenauer from comment #4)
> Actually I'm not sure what it is neither. It's not Gtk. To me it looks
> pretty KDEish/Qtish but I agree it's not Dolphin. The Gtk one looks really
> different so I'm officially confused here.

isn't this standard Firefox dialog? i mean really standard, neither KDE nor
GNOME (i.e. when Ui.allow_platform_file_picker is false)