打开运行对话框，输入
“C:\Program Files\Mozilla Firefox\firefox.exe” -p
如果你的firefox不是安装在默认位置，请根据实际情况修改。
点击确定后，出现选择用户配置文件对话框。
在这个对话框里可以添加、删除、重命名用户配置文件。
进入选择用户配置文件对话框后，先删除原来的用户配置文件，再创建一个新的。再次尝试安装附加组件就可以成功了。
注意：该操作会清除所有的历史记录、收藏夹等数据，请在操作前做好备份。
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