form not submitting in firefox

(function($) {
	$(document).ready(function() {

		function sd_replaceValidationUI(form) {
			// Suppress the browser's default validation bubbles
			form.addEventListener("invalid", function(event) {
				event.preventDefault();
			}, true);

			// Support Safari, iOS Safari, and the Android browser—each of which do not prevent form submissions by default
			form.addEventListener("submit", function(event) {
				if (!this.checkValidity()) {
					event.preventDefault();
				}
			});

			//When submit is clicked, check for errors and their corresponding existing error messages
			var submitButton = form.querySelector("button:not([type=button]), input[type=submit]");
			submitButton.addEventListener("click", function(event) {
				var invalidFields = form.querySelectorAll(":invalid"),
					errorMessages = form.querySelectorAll(".error-message"),
					parent;

				// Remove any existing messages
				for (var i = 0; i < errorMessages.length; i++) {
					errorMessages[i].parentNode.removeChild(errorMessages[i]);
				}

				//Get custom messages from HTML data attribute for each invalid field
				var fields = form.querySelectorAll(".sdForm-input");
				for (var i = 0; i < fields.length; i++) {
					var message = $(fields[i]).attr("data-ErrorMessage");
					$(fields[i]).get(0).setCustomValidity(message);
				}

				//Display custom messages
				for (var i = 0; i < invalidFields.length; i++) {
					parent = invalidFields[i].parentNode;
					parent.insertAdjacentHTML("beforeend", "<div class='error-message'>" +
						invalidFields[i].validationMessage +
						"</div>");
				}

				// If there are errors, give focus to the first invalid field
				if (invalidFields.length > 0) {
					invalidFields[0].focus();
				}
				// Submit the form as long as there are no errors
				if (invalidFields.length == 0 || typeof invalidFields === 'undefined') {
					$("form.sd_form").submit();
				}
			});

		}

		// Replace the validation UI for all forms
		var forms = document.querySelectorAll("form");
		for (var i = 0; i < forms.length; i++) {
			sd_replaceValidationUI(forms[i]);
		}


		//Changes the text of the dropdown to #666 when a selection is made
		$('.sdForm-inputWrap select').change(function() {
			$(this).css('color', '#666');
		});

		//Auto-format phone numbers while typing
		$(function() {
			$("input[type='tel']").keyup(function() {
				var curchr = this.value.length;
				var curval = $(this).val();
				if (curchr == 3) {
					$("input[type='tel']").val("(" + curval + ")" + "-");
				} else if (curchr == 9) {
					$("input[type='tel']").val(curval + "-");
				}
			});
		});

	})



})(jQuery);