Scroll to check for any firefox.exe processes and select them.Expand to get a detailed list of processes.Right-click on the Start Menu and open Task Manager.Firefox Not Responding, Firefox Is Already Running but Is Not Responding(Fixes) Kill Off the Running Process For Windows If it failed to do so, the error message appears the next time you open the browser. This lets the system know that the application is using that profile to run.Īs mentioned above, it’s going to remove that lock file when it shuts itself down. If a profile is already locked, it means that the browser application has created a lock file. You can reinstall the application without losing any of your settings.įor consistency reasons, the browser locks a profile folder when it starts up. This is particularly helpful when anything goes wrong in your Firefox. It is a folder in your local storage disk separate from the main Firefox program data. What is Firefox Profile?įirefox Profile stores all the changes that you stored in Firefox. To understand how we can fix this issue, first, we need to understand what a Firefox Profile is. Due to this, the system may falsely detect a different firefox running in the background.

Firefox may freeze due to application bugs and become unable to complete those tasks. There are a couple of tasks that firefox does when exiting. If this happens then firefox isn’t going to shut down by itself like it normally does. It is also possible that Firefox updated and some changes didn’t take place. But you may also get this message if firefox crashes while in the middle of something. This means that a different instance of firefox is running in the background.

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