Hammer for smashing page

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "manifest_version": 2,
    "name": "Hammer for smashing page",
    "short_name": "Hammer",
    "description": "Hammer gives you a quick, easy and satisfying way to remove unnecessary elements and get a clean and pretty page for you to enjoy.",
    "version": "1.0.4",
    "author": "Serhii Sakal",
    "background": {
        "persistent": false,
        "scripts": [
            "background.js"
        ]
    },
    "content_scripts": [
        {
            "matches": [
                ""
            ],
            "css": [
                "style.css"
            ],
            "js": [
                "content.js"
            ]
        }
    ],
    "browser_action": {
        "default_icon": {
            "16": "favicon\/icon16.png",
            "32": "favicon\/icon32.png"
        },
        "default_title": "Smash this page \ud83d\udd28"
    },
    "icons": {
        "16": "favicon\/icon16.png",
        "32": "favicon\/icon32.png",
        "48": "favicon\/icon48.png",
        "128": "favicon\/icon128.png"
    }
}