CleanMOCache is a free (for 1 - 2 systems), very powerful Mozilla/Netscape/Firefox/Opera and Windows XP cleaner. It will delete all browser tracks, AutoComplete, WinXP tracks and the deletion of user created additives. The following is a comprehensive list:

Mozilla/Netscape/Firefox/Opera cache files
Mozilla/Netscape/Firefox/Opera History and index.dat
Mozilla/Netscape/Firefox/Opera Cookies (with selective save)
Mozilla/Netscape/Firefox saved logins (with selective save)
Mozilla/Netscape/Firefox/Opera Typed URLs
Mozilla/Netscape/Firefox/Opera Form AutoComplete
Recent Documents
Start Run History
Search History
Windows Temporary Directory
Windows Media Player
Windows Word Pad
Microsoft Office Applications
Clipboard
Registry MRUs
Recycle Bins
Create additives to delete user specified files/directories and registry entries
Secure wiping (Single pass, DoD and NSA deletions)