【问题标题】：Firebug latest version 2.0.19 is not showing HTML in latest version of Mozilla Firefox 56 buttonFirebug 最新版本 2.0.19 未在最新版本的 Mozilla Firefox 56 按钮中显示 HTML 【发布时间】：2017-10-31 04:58:03 【问题描述】： I have followed this link as well But it didn't work. 【问题讨论】： 标签： firefox firebug 【解决方案1】： Firebug has been discontinued and is no longer supported. Firefox 用户应改用Firefox Developer Tools。 【讨论】：