In bug 465076, Enn writes: > >+.KUI-panel-closebutton { > >+ -moz-binding: url("chrome://global/content/bindings/toolbarbutton.xml#toolbarbutton-image"); > > There should be a means of referring to this binding via a type attribute or > other tag. If not, a bug should be created. A general imagebutton type element > is certainly needed.

I've thought that an <imagebutton> tag could be created which is just a combination image + button would be good to have, would eliminate the need to set the width/minwidth or moz-appearance, yet could also allow type="menu" to be used.

I'm not sure that <imagebutton> is appropriate, given that it's a toolbarbutton rather than a button.