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How do I delete the mozilla folder in the Application Data Folder?

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I uninstalled Mozilla and tried to delete the Mozilla folder in my Application Data folder but a message box pops up that says it's being used by another application. How do I delete the Mozilla folder?

I uninstalled Mozilla and tried to delete the Mozilla folder in my Application Data folder but a message box pops up that says it's being used by another application. How do I delete the Mozilla folder?

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You can try to boot the computer in Safe mode by pressing F8 on the boot window if you can't delete that folder.

Why do you want to delete that full folder?

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Because I uninstalled Mozilla