The only form elements missing from Firefox (according to http://caniuse.com/forms http://caniuse.com/forms) are the date/time, number and colour input types. I

The only form elements missing from Firefox (according to http://caniuse.com/forms http://caniuse.com/forms) are the date/time, number and colour input types. IE only partially supports the number input type, and doesn't support the rest. It's hard to believe you have to tell users to use IE over Firefox because of that difference.