Firefox 3 portable is a fully functional optimized package for use on a USB pen drive. A specialized launcher will allow most favorite extensions to work as you switch between home and usb pen version. I always use FF portable version while travling or from cybercafe computer. 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.
Download FireFox 3 Portable USB Pen / Device Friendly Version
- Visit offical project home page to grab latest version.
On a related news Mozilla estimated that more than 3 million times downloads just four hours after Firefox's official launch. Almost 5,000 and 14,000 downloads per minute. :)