tagline: From openSUSE
Since Firefox/Thunderbird 1.5 and SeaMonkey 1.0 the default filechooser dialog on platforms with gtk version >= 2.6.3 is the GTK one.
Newer Firefox versions have a nice KDE4 open/save dialog, so you will probably not want to change that setting.
If you don't like it, you can disable the usage and get back the old XUL implemented mozilla-native filechooser.
 FF/TB 1.5 and SM 1.0
Just add the following variable to your environment (e.g. to
$HOME/.bashrc) (and please note that this only works for packages provided by SUSE)
 FF/TB >= 2.0 and SM >= 1.1
about:config, search for "file_picker" and flip the preference