Firefox 3 has launched a few hours ago and you can also download a portable edition to use on the go. The portable edition is just like your regular edition but can be used from a external devices such as your flash drive.
Download the Firefox 3 Portable edition at PotableApps. On the sides Firefox has already crossed the 1.8 million download mark. You can help Firefox make the Guinness record by downloading Firefox 3. You can also check out the updated download counter here.