I get the message 'Firefox is already running, but not responding. To open a new window, you must first close the existing Firefox process, or restart your system'
rm $HOME/.mozilla/*/*/lock rm ~/.mozilla/*/*/.parentlock or rm ~/.mozilla/*/*/lock rm ~/.mozilla/*/*/.parentlock
Reference these pages: http://kb.mozillazine.org/Profile_in_use http://kb.mozillazine.org/Profile_folder#Where_is_my_profile_folder.3F