Update: Mobile Firefox version 2.0 is now available from U3 for free download. Mobile Firefox 2.0 – get it!
Mobile Firefox has an easy to use version of Firefox 1.5 which can run from your flash drive. The program still gets executed on the computer but all data, including temporary files are stored on the flash drive. This ability makes it easy to take your cookies, favorites and any other bookmarks or settings on the go.