This file is indexed.

/usr/lib/cura/plugins/USBPrinting/plugin.json is in cura 3.1.0-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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{
    "name": "USB printing",
    "author": "Ultimaker B.V.",
    "version": "1.0.0",
    "api": 4,
    "description": "Accepts G-Code and sends them to a printer. Plugin can also update firmware.",
    "i18n-catalog": "cura"
}