Either this has nothing to do with Firefox, or I've missed some new feature :P

If it's shortcuts or files on your desktop you're concerned about just rightclick them and delete them. Be aware that deleting shortcuts won't remove the file itself.

I have pictures that I want to remove from the list of desktop pics, can I remove them?

I think you are asking about the Windows XP desktop see:

• http://www.baycongroup.com/windows_xp/01_windows_xp_tips.htm#desktop
• http://en.wikipedia.org/wiki/Windows_XP
  • or more information http://en.wikipedia.org/wiki/Windows_XP
• http://en.wikipedia.org/wiki/Windows_XP

Please try asking in a forum related to Windows if you require more information. Possibly for instance

• http://windowssecrets.com/forums/forumdisplay.php/38-Windows-XP-Forum