Method 4: The Mozilla Profile is LockedĪnother reason for this error is that sometimes due to unknown errors the profile which the Mozilla Firefox creates gets locked. Note: If the Read-only is checked marked then Firefox will not be able to write in its folder and you will face the “Firefox is already running but is not responding” Error Message. Locate the Read-Only attribute and make sure it is blank. Select the General tab on the Properties Window. Make a right-click on that folder and select Properties. In the Run Window type the following command line: Press the Windows key on the keyboard and the letter R to open the Run Window. To check the permission status, follow these steps: Sometimes due to a system file error or read/write error, Firefox is not able to create any file as it loses the required permissions. In order to operate seamlessly, Mozilla Firefox creates system files in a profile folder created in the Firefox folder in the Program Files directory on your C drive. Look for any additional Firefox processes running and close them too.Ĭlose the Task Manager and restart Firefox. ![]() Locate Firefox or press the letter F to pinpoint the Firefox process. In the Task Manager window, select the Processes tab.
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