问为什么本地存储不能在Firefox57和Vuejs2上运行？

EN

<template>
    <nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">
    <div class="container-fluid">
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand"  id="menu-toggle" @click ="OpenMenu(menuclicked)"><span class="glyphicon glyphicon-list" aria-hidden="true"></span></a>
        </div>
        <div id="navbar" class="navbar-collapse collapse">
            <ul class="nav navbar-nav navbar-right">
                <li><a href="" @click="setLanguage('en')" >English</a></li>
                <li><a href="" @click="setLanguage('es')"> Spanish</a></li>

                <li v-for ="item in topNavbarOptions"><router-link v-on:click.native="item.clickEvent" :to="{name:item.route}"><span :class="item.icon"></span> {{ item.name}}</router-link></li>

            </ul>
        </div>
    </div>
</nav>
</template>
<script>  
import  'vue-awesome/icons';
import {HTTP} from '../common/http-common';  
export default {
    props:['topNavbarOptions'],
    data: function () {
        return {
            menuclicked: false

        }
    },
    created:function(){
       this.$i18n.set(localStorage.getItem("locale"));
    },
    methods: {
        OpenMenu: function (menuclicked) {
            this.menuclicked = !menuclicked;
            this.$emit('openmenu', this.menuclicked );
        },
        setLanguage:function(locale)
       {
          HTTP.get('lang/'+locale)
          .then(response =>{
              //Set locale from backend
            localStorage.setItem("locale", locale);

          })
          .catch(error=>{
          console.log(error);
          });

        }



    }

}
</script>