YouTube Thumbnails Grayscale

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "manifest_version": 3,
    "name": "YouTube Thumbnails Grayscale",
    "version": "1.0.1",
    "description": "Apply a grayscale filter to YouTube thumbnails",
    "action": {
        "default_icon": "icon.png",
        "default_title": "YouTube Thumbnails Grayscale"
    },
    "icons": {
        "16": "icon.png",
        "48": "icon.png",
        "128": "icon.png"
    },
    "background": {
        "service_worker": "background.js"
    },
    "content_scripts": [
        {
            "matches": [
                "*:\/\/www.youtube.com\/*"
            ],
            "css": [
                "styles.css"
            ]
        }
    ]
}