For some reason since I upgraded to the OS X Lion and Safari 5.1, when I open Safari it opens up multiple windows with previously visited websites. When I close some sites they reopen again in another window. Why is this happening?
How To Disable Lion's 'Resume' Feature - MacRumors.com
If you want to keep the resume feature in general, but want to have a fresh start in Safari, simply hold option down when quitting Safari.
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