content: tell application "Safari" 
  
      -- If Safari is already started then just bring
      -- it to the forefront otherwise open it.
      if it is running then
        reopen
      else
        activate
        reopen
      end if
  
      if it is running then
        activate
        set w to first window
        set bounds of w to {0, 0, 1280, 720}
  
        -- Each cycles takes about 2 mins. Aim for a test that takes an hour.
        repeat with i from 1 to 30
  
          set sites to {"http://cnn.com", "http://www.lapresse.ca", "http://www.nytimes.com", "http://theguardian.com"}
          repeat with site in sites
            open location site
  
            delay 15 
  
            set t to current tab of w
            close t 
          end repeat
        end repeat
  
        activate
      end if
  end tell