Viewer Counter for YouTube

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "manifest_version": 3,
    "name": "Viewer Counter for YouTube",
    "description": "Shows the number of regular viewers of the YouTube channels.",
    "version": "2.2.0",
    "permissions": [],
    "icons": {
        "16": "icons\/icon16.png",
        "32": "icons\/icon32.png",
        "48": "icons\/icon48.png",
        "128": "icons\/icon128.png"
    },
    "background": {
        "service_worker": "src\/service_worker.js",
        "type": "module"
    },
    "content_scripts": [
        {
            "matches": [
                "https:\/\/www.youtube.com\/*"
            ],
            "js": [
                "src\/content.js"
            ],
            "run_at": "document_start"
        }
    ],
    "action": {
        "default_icon": "icons\/default_icon.png",
        "default_title": "Viewer Counter for YouTube"
    },
    "default_locale": "en",
    "content_security_policy": {
        "sandbox": "sandbox allow-scripts; script-src 'self' https:\/\/www.gstatic.com\/ https:\/\/*.firebaseio.com https:\/\/www.googleapis.com"
    }
}