You _don't_ accidentally quit without saving, because if multiple tabs are open, it asks you if you really want to quit. If you want to revisit the now open tabs later: DON'T quit Safari. Just leave it open in the background. If you _must_ restart, relogin or relaunch Safari, _do_ create a bookmark-set. In other words: I'm quite content with how it's currently working.
Mac user since 1987. Running Mac OS X 10.8 Mountain Lion on a MacBook Air 11" & an iMac 27" and whatever's newest for my iPhone 4s, iPad 3 and AppleTV 2.
Apple Certified System Administrator 10.6, Apple Sales Professional 2008-2011, Apple Certified Mac Technician.