manifest.json

{
    "manifest_version": 2,
    "name": "Hack The North submission",
    "description": "Supercharges facebook messenger",
    "version": "1.0",
    "background": {
        "scripts": ["background.js"],
        "persistent": false
    },
    "permissions": [
        "declarativeContent",
        "activeTab"
    ],
    "content_scripts": [{
        "matches": [
            "http://www.facebook.com/messages/*",
            "https://www.facebook.com/messages/*"
        ],
        "css": [],
        "js": [
            "content_scripts/jquery.min.js",
            "content_scripts/main.js"
        ]
    }, {
        "matches": [
            "http://www.messenger.com/*",
            "https://www.messenger.com/*"
        ],
        "css": [
            "content_scripts/materialize.min.css"
        ],
        "js": [
            "content_scripts/jquery.min.js",
            "content_scripts/materialize.min.js",
            "content_scripts/fabric.min.js",
            "content_scripts/socket.io.min.js",
            "content_scripts/socket.io-stream.js",
            "content_scripts/messenger.js"
        ]
    }]
}