manifest.json

{
    "name": "URL Gathering Tool",
    "description": "An  extension that gathers all URLs currently open in browser, allowing them to be easily copied.",
    "version": "0.0.4",
    "manifest_version": 3,
    "offline_enabled": true,
    "background": {
        "service_worker": "vendor/serviceWorker.js"
    },
    "permissions": [
        "tabs",
        "storage"
    ],
    "icons": {
        "16": "asset/img/16.png",
        "32": "asset/img/32.png",
        "180": "asset/img/180.png",
        "192": "asset/img/192.png",
        "512": "asset/img/512.png"
    },
    "action": {
        "default_popup": "popup.html",
        "default_icon": {
            "16": "asset/img/16.png",
            "32": "asset/img/32.png",
            "180": "asset/img/180.png",
            "192": "asset/img/192.png",
            "512": "asset/img/512.png"
        }
    }
}