Don't add custom search engines

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "author": "Greg Sadetsky et al.",
    "manifest_version": 3,
    "name": "Don't add custom search engines",
    "version": "0.0.7",
    "description": "Prevent Google Chrome from auto-adding custom search engines",
    "homepage_url": "https:\/\/github.com\/gregsadetsky\/chrome-dont-add-custom-search-engines",
    "minimum_chrome_version": "88.0.0.0",
    "offline_enabled": true,
    "content_scripts": [
        {
            "matches": [
                "<all_urls>"
            ],
            "js": [
                "content.js"
            ],
            "run_at": "document_start"
        }
    ],
    "background": {
        "service_worker": "bg.js"
    },
    "icons": {
        "64": "icon-64.png",
        "128": "icon-128.png"
    },
    "action": {
        "default_title": "Don't add custom search engines",
        "default_icon": "icon-64.png"
    },
    "optional_host_permissions": [
        "*:\/\/*\/*"
    ]
}