Every restart your Mac and have it boot up only to open all the last Safari windows you had just opened? This feature – introduced a few operating systems ago – is something I personally don’t like at all. Perhaps I’m a “power user” but I often find that I open so many browser windows in the course of my work that I don’t really want them to all re-open
Ostensibly, Safari appears to have a preference to turn this off or on, here:
However in my version of Safari (7.0.6 on Mac OS X 10.9.5), this preference appears to not actually work at all. (annoying)
So here’s how to go into your system defaults and turn it off for real:
defaults write com.apple.Safari NSQuitAlwaysKeepsWindows -bool false