Chrome扩展的Manifest必须包含name、version和manifest_version属性，目前来说manifest_version属性值只能为数字2，对于应用来说，还必须包含app属性。

{
    "app": {
        "background": {
            "scripts": ["background.js"]
        }
    },
    "manifest_version": 2,
    "name": "My Extension",
    "version": "versionString",
    "default_locale": "en",
    "description": "A plain text description",
    "icons": {
        "16": "images/icon16.png",
        "48": "images/icon48.png",
        "128": "images/icon128.png"
    },
    "browser_action": {
        "default_icon": {
            "19": "images/icon19.png",
            "38": "images/icon38.png"
        },
        "default_title": "Extension Title",
        "default_popup": "popup.html"
    },
    "page_action": {
        "default_icon": {
            "19": "images/icon19.png",
            "38": "images/icon38.png"
        },
        "default_title": "Extension Title",
        "default_popup": "popup.html"
    },
    "background": {
        "scripts": ["background.js"]
    },
    "content_scripts": [
        {
            "matches": ["http://www.google.com/*"],
            "css": ["mystyles.css"],
            "js": ["jquery.js", "myscript.js"]
        }
    ],
    "options_page": "options.html",
    "permissions": [//声明需要跨域的域名
        "*://www.google.com/*"
    ],
    "web_accessible_resources": [
        "images/*.png"
    ]
}