On June 11, 2012, Apple released a developer preview of Safari 6.0 with a feature called iCloud Tabs, which allows users to 'sync' their open tabs with any iOS or other OS X device running the latest software. Safari 6 also included new privacy features, including an "Ask websites not to track me" preference, and the ability for websites to send OS X 10.8 Mountain Lion users notifications, although it removed RSS support. Safari 6 has the Share Sheets capability in OS X Mountain Lion. The Share Sheet options are: Add to Reading List, Add Bookmark, Email this Page, Message, Twitter and Facebook. Tabs with full-page previews were added, too.