The online US non-immigrant visa application site - https://www.vfs-usa.co.in/ doesn't allow you to submit the visa application using the popular Firefox browser.

However it never says it explicitly. Only when you try to go through the screens, it will incorrectly throw date errors which are impossible to fix in Firefox.

While US Government warned against using Internet Explorer as early as 2004, US Consulate Visa site doesn't allow alternative popular browsers like Firefox!