We've covered the beta version of Firefox 3 portable before. But since the world wide release of Firefox 3, the team over at PortableApps has upgraded the beta version to the release version of this very popular web browser

Unlike the standard Windows version of Firefox 3 that requires a standard Windows installation, the portable version can be executed in any directory, even right off a USB thumb drive. This makes it great for taking your own browser, complete with cookies and favorites, with you for use on any Windows computer. When you're done, remove the thumb drive from the host computer leaving virtually no trace of your online activities.

The portable version is a 8MB download and available now at PortableApps.com.