Extjs tabpanel内嵌iframe火狐无法显示解决思路

width:Ext.getBody().getWidth()/2,
height:Ext.getBody().getHeight()/2,
items:[{
    height:Ext.getBody().getHeight()/2-25,
    xtype:"tabpanel",
    enableTabScroll:true,
    activeTab:0,
    items:[
        {title:"t1 ",
         html:"<iframe id='selects' width=100% height=100% frameborder=0 scrolling=auto src=component/systemSelect.jsp></iframe>"
         },
         {title:" t2 ",
         html:"<iframe id='selects' width=100% height=100% frameborder=0 scrolling=auto src=component/userSelect.html></iframe>"
          }]
       }]