Auto lock480p for Youtube

{
    "background": {
        "persistent": true,
        "scripts": [
            "js\/background.js"
        ]
    },
    "browser_action": {
        "default_icon": "images\/i4.png",
        "default_popup": "html\/popup.html"
    },
    "content_scripts": [
        {
            "all_frames": true,
            "css": [],
            "js": [
                "js\/library_youtube.js"
            ],
            "matches": [
                "*:\/\/www.youtube.com\/*"
            ],
            "run_at": "document_start"
        }
    ],
    "content_security_policy": "script-src 'self' https:\/\/ssl.google-analytics.com https:\/\/www.google-analytics.com https:\/\/apis.google.com https:\/\/ajax.googleapis.com; style-src 'self' 'unsafe-inline' 'unsafe-eval' ; connect-src *; object-src 'self' ",
    "default_locale": "en",
    "description": "__MSG_appDesc__",
    "icons": {
        "128": "images\/default.png"
    },
    "manifest_version": 2,
    "name": "__MSG_appName__",
    "permissions": [
        "activeTab",
        "alarms",
        "contextMenus",
        "privacy",
        "storage",
        "tabs",
        "unlimitedStorage",
        "webNavigation",
        "webRequest",
        "webRequestBlocking",
        "http:\/\/*\/*",
        "https:\/\/*\/*",
        "notifications"
    ],
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "version": "0.0.1"
}