I am trying to create a chrome extension. My manifest file is

{

    "name": "Alert-Beep",

    "action": {},

    "manifest_version": 3,

    "version": "0.1",

    "description": "Beeps if alert() is called",

    "content_security_policy": "script-src 'self'; object-src 'self'",

    "permissions": [

    "activeTab",

    "scripting"

    ],

    "content_scripts": [

    {

        "matches": ["https://*.com/*"],

        "js": ["alert-beep.js"],

        "run_at": "document_start"

    }

    ]

}

Loading the extension fails with the message

Failed to load extension

File

~alert-beep

Error

Invalid value for 'content_security_policy'.

Could not load manifest.

What am I doing wrong?