Auto-Reload Target URL

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "name": "Auto-Reload Target URL",
    "version": "1.4.1",
    "manifest_version": 3,
    "description": "Reloads a target URL every specified seconds.",
    "background": {
        "service_worker": "background.js"
    },
    "action": {
        "default_icon": "stopwatch22.png",
        "default_popup": "info.html"
    },
    "content_scripts": [
        {
            "matches": [
                "*:\/\/*\/*"
            ],
            "js": [
                "timer.js"
            ]
        }
    ],
    "host_permissions": [
        "http:\/\/*\/*"
    ],
    "permissions": [
        "tabs",
        "storage",
        "alarms"
    ],
    "icons": {
        "16": "stopwatch16.png",
        "48": "stopwatch48.png",
        "128": "stopwatch128.png"
    }
}