I convert <selects>-s to Ext.comboboxes im my project.
Thince beta 1 I get an additional field with name "" submitted with the form.
There was one line added to the source in beta 1:
// prevent input submission
this.el.dom.name = '';
(Combo.js, Line 117)
At last in FF 18.104.22.168 this does NOT prevent submission!
As a result I have this empty-named field the server can't handle.