So you want to test how your CSS code actually rendered in Internet Explorer and Firefox without switching back and forth to IE and Firefox windows ?. If so, then CSSVista is for you.
CSSVista is a free Windows application for web developers which lets you edit your CSS code live in both Internet Explorer and Firefox simultaneously.
CSSVista is a free software that offer a live CSS editing and preview of the rendering CSS code on both Internet Explorer and Firefox at the same time through splitted pane view window. This software can be downloaded for free from SiteVista
CSSVista is part of SiteVista, as paid testing service for web developers. This site offering a testing services to see how precisely a web design appear in a wide range of web browsers and at different screen resolutions.