To Whom: ever since firefox upgraded to version 5 and now to version 6 I have an issue with the "firefox is already running, but is not responding. To Open a new window, you must first close the existing firefox process, or restart your system." I have became a master at the ctrl-alt-delete and ending the firefox process, but I have to say that this is becoming very annoying and frustrating (specially when I need to check something quickly on my computer). I've been an avid user for years. I just looked at Google Chrome and was disappointed with that program because it does not have the features that I have relied on for so long with Firefox. I've been through the firefox help. I was unable to find the parent.lock file in my profile. I tried deleting my profile and recreating the profile. I have deleted the entire program twice now and reinstalled and basically I am left with the same issue. I must say the definition of insanity is starting to show. Any additional help / correction would be beneficial. If I need to send you my computer diagnostics I can send via hijack this or any other program you need. I want to get this resolved so that I can continue using firefox and enjoy using the program. sincerely Daniel Schwerin, MD