manifest.json

{
    "name": "Google Music Applet",
    "version": "1.1",
    "description": "Lightweight music playback controls and now playing information for Google Music Beta created by Kyle Kamperschroer",
    "homepage_url" : "https://chrome.google.com/webstore/detail/fjiolbglibkahkipcdgeepdfdgfkdbee?hl=en-US",

    "browser_action": {
        "default_icon": "images/icon48.png",
        "popup": "html/background.html",
        "default_title": "Music Beta Player Applet"
    },
    
    "content_scripts": [
        {
            "matches" : ["*://music.google.com/*"],
            "js" : ["js/jquery.js"],
            "run_at" : "document_start"
        },
        {
            "matches" : ["*://music.google.com/*"],
            "js" : ["js/contentscript.js"]
        }
    ],
        
    "permissions": [
        "tabs",
        "*://music.google.com/*"
    ]
}