Mavericks has plenty of modest refinements that add up to a system well worth the upgrade — even if Apple weren’t giving it away for free.
Many years ago, Web surfing changed dramatically when the Opera browser offered a way to open multiple Web pages in tabs instead of separate windows that cluttered the computer desktop. Most browsers soon followed.
That concept now comes to file management as part of Mavericks, which Apple released Tuesday for new Macs and older ones running Snow Leopard, Lion or Mountain Lion. You can now use tabs rather than separate windows for various folders, disks and networked servers. More