javascript - Form validation skips in firefox after many clicks -

i have validation on form, 1 field. deals phone number:

<form action="/cabinet/company/get_money.php" method="post" class="form-inline" id="get-balans">                             <label for="phone" class="p10"><strong>Контактный телефон для связи с Вами:</strong></label>                             <div class="row">                                 <div class="col-md-2">                                     <div class="section">                                         <label class="field prepend-icon">                                             <input type="text" name="phone" id="phone" data-msg-minlength="Укажите пожалуйста телефон полностью" value="<?=$aruser['work_phone']?>" class="gui-input"  data-rule-minlength="8"  data-rule-required="true" data-msg-required="Укажите пожалуйста телефон полностью">                                             <label for="org_name" class="field-icon">                                                 <i class="fa fa-phone"></i>                                             </label>                                         </label>                                     </div>                                 </div>                                 <div class="col-md-3">                                     <input type="submit" name="send" class="btn btn-system" value="Запросить пополнение баланса">                                 </div>                                 <div class="col-md-7 text-right">                                     <a href="/register/premium.php" class="btn btn-system" style="margin-right: 20px">Тарифы на премиальные услуги</a>                                 </div>                             </div>                         </form> 

validation handles jquery validation plugin:

$(function(){          $("#phone").mask("+7 (999) 999-9999");      var form = $("#get-balans");     form.validate({         errorclass: "state-error",         validclass: "state-success",         errorelement: "em",         rules: {             confirm: {                 equalto: "#password"             },         },         highlight: function(element, errorclass, validclass) {             $(element).closest('.field').addclass(errorclass).removeclass(validclass);             $(element).closest('.input-group').addclass(errorclass).removeclass(validclass);         },         unhighlight: function(element, errorclass, validclass) {             $(element).closest('.field').removeclass(errorclass).addclass(validclass);             $(element).closest('.input-group').removeclass(errorclass).addclass(validclass);         },         errorplacement: function(error, element) {             if (element.is(":radio") || element.is(":checkbox")) {                 element.closest('.option-group').after(error);             } else {                 error.insertafter(element.parent());             }         }     });       $("#get-balans").submit(function(){         form.validate();          return form.valid();     }) }); 

the problem in firefox mozilla (the newest version), skips validation , send form after multiple pressing on button. how can fix it?