Mozilla Firefox®, Portable Edition is the popular Mozilla Firefox web browser bundled with a PortableApps.com Launcher as a portable app, so you can take your bookmarks, extensions and saved passwords with you.
Mozilla Firefox is a fast, full-featured web browser that's easy to use. It has lots of great features including popup-blocking, tabbed-browsing, integrated search, improved privacy features, automatic updating and more. Plus, thanks to the PortableApps.com launcher bundled in the Mozilla Firefox, Portable Edition, it leaves no personal information behind on the machine you run it on, so you can take your favorite browser along with all your favorite bookmarks and extensions with you wherever you go
更新：http://portableapps.com/support/firefox_portable#version_history
官网：http://portableapps.com/apps/internet/firefox_portable
说明一下：有人可能弄不来简体语言。到http://addons.mozine.cn/去找Locale Switcher安装，当然下面的简体语言包扩展也要装，装好了，重启程序，在菜单Tools那里可以选择的。。。
官方下载：(右键另存为~)点击这里下载文件
简体语言包：点击这里下载文件