Normally this is completely transparent to the user however, in the case of an abnormal shutdown, the application might not delete the lock file, preventing you from using the profile. Otherwise, it creates a lock file in the profile and deletes it at exit. If the lock file already exists, the application exits with an error message. This is done by checking for the existence of a lock file when it starts. To avoid conflicts, Mozilla applications such as Firefox, Thunderbird, and Mozilla Suite/SeaMonkey are designed to allow only one copy of the application to access a profile at the same time. It might still be running in the background (even though it's not visible) or it might have closed abnormally, without deleting the lock file. The most common cause of this error is that your Mozilla application did not shut down properly. Note: Starting in Firefox 34 on Windows (Vista and above), the "Firefox is already running" dialog includes a "Close Firefox" button (shown here) that, when clicked, will dismiss the dialog, end the Firefox process(es) and, after a few seconds, will automatically restart Firefox. The old Firefox process must be closed to open a new window. 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 running copy of Firefox will quit in order to open this one.
#FIREFOX PROFILE MANAGER WONT OPEN MAC#
(On Mac OS) A copy of Firefox is already open.Only one copy of Firefox can be open at a time."
#FIREFOX PROFILE MANAGER WONT OPEN HOW TO#
This article explains how to regain access to a locked or unavailable profile.
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