manifest.json

{
    "name": "Steam Key Extension",
    "short_name": "SKE",
    "display": "standalone",
    "start_url": "/",
    "theme_color": "#212121",
    "background_color": "#212121",
    "icons": [{
        "src": "img/icons/icon-64x64.png",
        "sizes": "64x64",
        "type": "image/png"
    }, {
        "src": "img/icons/icon-128x128.png",
        "sizes": "128x128",
        "type": "image/png"
    }, {
        "src": "img/icons/icon-144x144.png",
        "sizes": "144x144",
        "type": "image/png"
    }, {
        "src": "img/icons/icon-152x152.png",
        "sizes": "152x152",
        "type": "image/png"
    }, {
        "src": "img/icons/icon-192x192.png",
        "sizes": "192x192",
        "type": "image/png"
    }, {
        "src": "img/icons/icon-256x256.png",
        "sizes": "256x256",
        "type": "image/png"
    }, {
        "src": "img/icons/icon-512x512.png",
        "sizes": "512x512",
        "type": "image/png"
    }]
}