If you have uninstalled the Little Snitch Mini app by removing it from Launchpad, deleting it via Terminal or by using third party software removal tools, the Little Snitch Mini network extension still remains installed and running.
If you inadvertently ran into this issue, you can do the following to resolve the problem:
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Re-install Little Snitch Mini from the Mac App Store.
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Open the Little Snitch Mini app.
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Open the Little Snitch Mini menu from the menu bar while holding down the Option key.
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Choose Deactivate Network Extension… from the menu.
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You will be asked for an administrator’s password to uninstall the system extension.
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After successful uninstallation of the system extension you can move the Little Snitch Mini app in Finder from the Applications folder to the trash.
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A dialog will appear, informing you that Little Snitch Mini is hosting system extensions and that they will be removed. Confirm this dialog with Continue.