JQuery Ajax call seems to work fine in Chrome but not in Firefox nor IE, what could be the cause?

I am testing this applicaition where there an ajax call. It works well in Chrome but I keep on getting errors in Firefox and IE.

$.ajax({

            url: '/Controller/Action/',

            type: "POST",

            dataType: "json",

            async: false,

            data: form,

            error: function(xhr, status, error) {

            },

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