DoubleClick on Disabled TexField doesn't work in Firefox

[It_Barney]

Tested on Firefox 15.0.1; everything's ok when tested on Internet Explorer or Chrome.
Please see my sample code:

public class TestFirefox implements EntryPoint {
    public void onModuleLoad() {
        TextField tf = new TextField();
        tf.setEnabled(false);
        tf.addDomHandler(new DoubleClickHandler() {
            public void onDoubleClick(DoubleClickEvent event) {
                AlertMessageBox am = new AlertMessageBox("OK", "DoubleClicked");
                am.show();
            }
        }, DoubleClickEvent.getType());
        RootPanel.get().add(tf);
    }
}

[It_Barney]

I think this is a very important bug, also very easy to detect.
It can jeopardize the usability of a GXT Application on a very popular browser like Firefox is.