Demo extension is working!

Manifest.json
{
    "name": "IIITK",
    "version": "0.0.2",
    "description": "INDIAN INSTITUTE OF INFORMATION TECHNOLOGY KOTTAYAM",
    "manifest_version": 2,
    "browser_action": {
        "default_popup": "demo.html",
        "default_icon": "/ICON.png"
    }
}

Html

html>
    <head>
        <h1>Demo extension is working!</h1>
    </head>
</html>