Log object attributes using the .watch() method. This is only supported by Firefox.

objectAttrLogging_FF.js

// To log individual attributes
myWidget.options.watch('displayHeight', function(id, oldval, newval) {
    console.log('id = %s, oldval = %s, newval = %s', id, oldval, newval);
    return newval;
});

myWidget.options.watch('displayWidth', function(id, oldval, newval) {
    console.log('id = %s, oldval = %s, newval = %s', id, oldval, newval);
    return newval;
});

// To log all attributes in an object
for (i in myWidget.options) {
    myWidget.options.watch(i, function(id, oldval, newval) {
        console.log('id = %s, oldval = %s, newval = %s', id, oldval, newval);
        return newval;
    });
}