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X-Firefox is a free and open source web browser descended from the Mozilla Application Suite and managed by Mozilla Corporation. To display web pages, Firefox uses the Gecko layout engine, which implements most current web standards in addition to a few features which are intended to anticipate likely additions to the standards. Latest Firefox features include tabbed browsing, a spell checker, incremental find, live bookmarking, a download manager, private browsing, location-aware browsing (aka "geolocation") based exclusively on a Google service and an integrated search system that uses Google by default in most localizations. Functions can be added through add-ons, created by third-party developers, of which there is a wide selection, a feature that has attracted many of Firefox's users.