manifest.json

{
    "name":"Hello Extension",
    "description":"First Extensions to google chrome",
    "version":"0.1",
    "manifest_version":2,

    "browser_action":{
        "default_popup":"index.html",
        "default_icon":"xmind.png"
    },
    "commands":{
        "_execute_browser_action":{
            "suggested_key":{
                "default":"Ctrl+Shift+F"
            },
        "description":"Open index.html and salute the awesomeness"
        }
    }
}