def unfreeze_extensions(self):
        """Remove a previously frozen list of extensions."""

        output_path = os.path.join(_registry_folder(), 'frozen_extensions.json')
        if not os.path.isfile(output_path):
            raise ExternalError("There is no frozen extension list")

        os.remove(output_path)
        ComponentRegistry._frozen_extensions = None
Remove a previously frozen list of extensions.