manifest.json

{
"update_url": "https://clients2.google.com/service/update2/crx",

	"manifest_version": 2,
    "name": "Quantum",
    "short_name": "Quantum",
    "description": "A simple and elegant code editor.",
    "version": "5.0",
    "minimum_chrome_version": "38",
    "offline_enabled": true,

    "permissions": [
        "storage",
        "unlimitedStorage",
        {
            "fileSystem": ["write", "retainEntries", "directory"]
        }
    ],

    "icons": {
        "128": "assets/icon-128.png"
    },

    "app": {
        "background": {
            "scripts": ["background.js"],
            "persistent": false
        }
    },

    "file_handlers": {
        "text": {
            "types": [
                "application/javascript",
                "application/json",
                "application/x-shellscript",
                "application/xml",
                "text/*"
            ]
        }
    }
}