我这里下载的是火狐35.0.1
安装之后，要设置不更新
设置之后看一下是否检查更新，点击工具栏上的帮助，关于Firefox，可以看到Firefox信息以及是否在更新。
需要修改配置文件channel-prefs,js...默认路径是：C:\Program Files (x86)\Mozilla Firefox\defaults\pref
将release改为defalut。会提示没有权限修改，复制一份出来，修改后，粘贴进去，代替原有文件就好了。
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
pref("app.update.channel", "default");
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
pref("app.update.channel", "default");