Now all are Using Firefox instead of IE .Now there are some bugs in Firefox which arrives when we unknowingly close firefox window and when you restart Firefox it asks to restore a previous session.
which is not safe when you leave your personal info on the session that includes,emails or anything regarding your privacy when other persons just clicks “Restore Session” he access all your info.Take a look how to fix this.
1.Open your Firefox Browser and type “about:config” without quotes.and press Enter
2.And navigate to “browser.sessionstore.resume_ from_crash” and double click it and it will automatically set to False.
3.Restart your Firefox Browser.
Note:Firefox used here is Firefox2.0
Update:This applies to Firefox 3.0 also