您安装了广告拦截器吗?这可能会隐藏那个
额外的一点说明:当AdBlock Plus屏蔽它时,FireBug实际上会在Style面板中显示此类内容(为了清晰起见包装):
.mainad, #mainad { undefined (line 233)
-moz-binding:url(chrome://global/content/bindings/
general.xml?abphit:707307897865#basecontrol) !important;
}