how to automatically clear private data while closing your browser

google chrome
1.open settings in google chrome.
2. click "ADVANCED SETTINGS " at the bottom of the page
3. click "CONTENT SETTINGS" under the PRIVACY HEADER
4. Under "Cookies" select "KEEP LOCAL DATA ONLY UNTIL I QUIT MY BROWSER"
5. click ok

FIREFOX
1. from the menu bar click the "TOOLS" button
2. click "options"
3. click "PRIVACY" tab
4. select "USE CUSTOM SETTINGS FOR HISTORY"
5. done

INTERNET EXPLORER
1. CLICK "TOOLS"
2. click "INTERNET OPTIONS"
3.  click "DELETE BROWSING HISTORY ON EXIT"  at the bottom
4. CLICK "OK"

5. click on " CLEAN RECENT HISTORY" AND  CLICK OK.