This means that users will benefit from everything that the normal Firefox offers, including its latest engine (Gecko), latest GUI, and latest features including tabbed browsing, a download manager, support for live bookmarking, private browsing, location-aware browsing, Firefox sync, support for add-ons, and so forth. X-Firefox offers 100% of the functions found in the normal, installer version of Mozilla Firefox. X-Firefox is offered by winPenPack, an interesting project that offers people some of the most well-renowned open-source software made portable. X-Firefox is an official portable version of the popular Mozilla Firefox web browser aimed specifically at users who either don't want to clutter their computer's OS registry or have a need to run the software directly from external storage devices (even though it can also be run from the hard-drive).