One of the new Safari features that I really like is Tab Previews. You roll your mouse over a tap in Safari and a preview of the site pops out. This is especially useful if you have multiple tabs open. Some people think that Tab Previews just get in the way, they find them annoying. If this is you, then read this article about how to disable Safari Tab Previews. It involves the use of the Terminal App, but the procedure is simple.