"MAB Screen Shot Mab is a Rich Web Application to search products on all 6 Amazon-branded sites (com, ca, co.uk, fr, co.jp), showing results in a handy interface, typical of desktop programs. MAB lets you search within one window without distracting you with plenty of images and texts not concerning what you are effectively looking for. MAB can make you feel like the world's most powerful bookstore clerk!"
I am surprised that their are not more applications that are similar to this. ajaxWrite uses XUL as well. Firefox is not just a browser but a platform. I wish they would begin marketing as such!
Their is a remote application version you can try, that doesn't require any installation. Try it!