在chrome上请求查询$ submit可以，但是在Firefox上没有

Question

我的html代码

              <form>

                <input type="radio" name="a" value="enter burger"> Enter burger.<br>
                <input type="radio" name="a" value="They decide to go left for help."> They decide to go left for help.<br>
                <input type="radio" name="a" value="Walks up street."> Walks up street.<br>  
                <div id='proceed'>
                <input style="color:darkred" type="submit" value="Proceed">
                </div>
              </form>
          </div>
          </div>

我的JavaScript代码

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
              <script type='text/javascript'>
  $(function(){
   $('form').on('submit',function(){
   event.preventDefault();
       var value=$("input[name=a]:checked").val();
     switch(value){
       case "enter burger":  location.href='project1.html'; break;
     case "Walks up street.":  location.href='project2.html'; break;
     case "They decide to go left for help.":                                                                             location.href='project2.html';        break;

     }
   });
});
</script>

当我使用chrome时，它可以工作，但是当我使用Firefox时，它会显示：

file：///home/mario/Desktop/index/project.html？a = enter + burger