Don't know if it happens with other emails like yahoo, but in gmail -- If I attach a file to an email I'm sending through the web (mail.google.com), I cannot delete or move that file on my PC, even after the email has been sent or even after the gmail tab has been closed (although other tabs still remaining open), If I try to delete the file, PC complains: TITLE OF DIALOG BOX: "Error Deleting File or Folder" MESSAGE IN BOX: "Cannot deleted : It is being used by another person or program. Close any programs that might be using the file and try again." This doesn't happen in Google Chrome or IE 7. It causes difficulty since a lot of files are created for temporary use to be emailed to someone, and if user can't close the file until the entire Firefox program is closed (all tabs and all occurrences of Firefox), those files stay on the desktop or other places and one easily forgets later. Thanks in advance for your help. == This happened == Every time Firefox opened