Why am I told Firefox is running, when its not?
Every time you click on the shortcut to launch Mozilla Firefox, you get a pop-up message box saying: “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.” The Xania.org and Mozillazine.org websites have solutions to this problem for Linux, Windows and Mac. Select the solution which best suits your operating system. The cause seems to be a .parentlock file which has remained locked after a crash, preventing further use of the application. You need to remove this file (which resides in the .mozilla folder in your home folder) to get back up and working again.
