How do I clean up the Firefox profile if the browser refuses to start?
If your Firefox browser refuses to start and displays a message telling you that Firefox is already running, you can run the following two commands to clean up your Firefox profile. Please, first ensure that there really are no other instances of Firefox running, next start a terminal by clicking on the Konsole icon on the KDE panel (at the bottom of the screen), and then run: rm `find .mozilla/ -name lock` rm `find .mozilla/ -name .