JFileChooser - FireFox on OS X - showSaveDialog returns immediately or hang

Question

I have a singed applet that uses the JFileChooser to allow the suer to pick a file location. This works with FF and IE on Windows, works with Safari on OS X and used to work with FF on OS X. However a bug was just discovered where it no longer works with FF on OS X.
JFileChooser chooser = new JFileChooser();
// ask the user where we should save the file
chooser.setCurrentDirectory(new File(System.getProperty("user.home")));
System.out.println("*************************** "+System.getProperty("user.home"));
chooser.setSelectedFile(new File(attachmentName));
chooser.setDialogTitle("Save Attachment - " + attachmentName);
int returnVal = chooser.showSaveDialog(null);
System.out.println("*************************** "+returnVal);
Doing the above I either get a complete hange of the broswer and VM or the showSaveDialog call returns immediately with a value of ERROR_OPTION and then the dialog is displayed.
It doesn't seems to make a difference where I put the above code.
We were supposed to do a release of the software today but this is a show stopper. Any help would be great.

Answer 1

I've now tried the following:
public void doit() {
Runnable getTextFieldText = new Runnable() {
public void run() {
System.out.println("%%%%%%%%%%%%%%%%%%%%%%%%%% 1 "+ SwingUtilities.isEventDispatchThread() );
JFileChooser chooser = new JFileChooser();
System.out.println("%%%%%%%%%%%%%%%%%%%%%%%%%% 2 "+ SwingUtilities.isEventDispatchThread() );
chooser.setCurrentDirectory(new File(System.getProperty("user.home")+"/Desktop/"));
System.out.println("%%%%%%%%%%%%%%%%%%%%%%%%%% 3 "+ SwingUtilities.isEventDispatchThread() );
chooser.setSelectedFile(new File("fred"));
System.out.println("%%%%%%%%%%%%%%%%%%%%%%%%%% 4 "+ SwingUtilities.isEventDispatchThread() );
chooser.setDialogTitle("Save Attachment - ");
System.out.println("%%%%%%%%%%%%%%%%%%%%%%%%%% 5 "+ SwingUtilities.isEventDispatchThread() );
int returnVal = chooser.showSaveDialog(null);
System.out.println("@@@@@@@@@@@@@@@@@@@@@@@@@@@@ "+returnVal);
try{
SwingUtilities.invokeLater(getTextFieldText);
}catch(Exception x){
x.printStackTrace();
Which works everywhere except FF which hang after the user dismisses the dialog. I'm begging for any insight here.