The mozilla site mentions to look for such processes. Your instructions are more specific and I'll use them when this happens again. Thanks! <div>On 5/8/07, Gavin McCullagh <<a href="mailto:gmccullagh@gmail.com">gmccullagh@gmail.com</a>> wrote:<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> On Tue, 08 May 2007, Scott Ledyard wrote: > About once a week, a student approaches me and says that Firefox is > broken. When you try to run Firefox, a message comes up that says that > it's already running.  Re-logging in does not help. The end-of-day > reboot does! This was a problem in Edubuntu thin client 6.10 and now > in 7.04. Firefox stops people from running it twice on the same profile.  This is to prevent nasty behaviour such as two copies of firefox trying to both modify your bookmarks file at the same time. You can do: ps aux |grep firefox to see what firefox processes are lying around.  If you see one under that person's username, you probably need to kill it before they can start another. Gavin </blockquote></div>