Firefox is not IE8, which declared lot of CSS3 and HTML5 standards as "won't be supported" in 2009, paving the way for its own extinction. USDS serves basic pa

Firefox is not IE8, which declared lot of CSS3 and HTML5 standards as "won't be supported" in 2009, paving the way for its own extinction. USDS serves basic pages and applets which work fine on Firefox. It is only a handful of very complex web apps like Photopea where the developer will say "run this on Chrome for best results".