I'm not interested in Firebug, a XUL debugger, or a JavaScript editor, but a true WYSIWYG IDE for XUL form design.
I use XUL Explorer for doing quick mock-ups of things or checking out elements with which I'm not familiar. It's not WYSIWYG, but you can drag and drop elements.
I just wanted to note that I do XUL development with ActiveState KomodoEdit. It doesn't have WYSIWYG XUL gui design but it recognizes XUL files and can give you code hints for the XUL namespace as well as their corresponding JS files.
Note that Komodo was written in XUL as well. It works very well for me :-)
There is one Wysiwyg editor called XUL Gear
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