Firefox 2.0, a web browser, has spell check support for user-written content, such as when editing Wikitext, writing on many webmail sites, blogs, and social networking websites. The web browsers Google Chrome, Konqueror, and Opera, the email client Kmail and the instant messaging client Pidgin also offer spell checking support, transparently using previously GNU Aspell and currently Hunspell as their engine. Mac OS X now has spell check system-wide, extending the service to virtually all bundled and third party applications.