gladder是一个Firefox扩展，名字被解释为Great Ladder （Ladder for Great Firewall 防火长城之梯），目标是帮助人们跨过防火长城访问境外被查封的网站。
下载地址： 访问https://addons.mozilla.org/firefox/2864（点击页面中的Install Now 按钮可以直接安装）
安装成功后，你会发现Firefox状态栏多了一个小梯子：
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