How to upgrade Manifesto 2 version to Manifesto 3?

Question

Browser extensions

Hello everyone, I’ve been sitting for hours and thinking about this,
I tried other examples from stackoverflow, but I didn’t succeed
with the documentation, too,

please help
here is my code:

{
    "version": "1",
    "name": "Bux.am - Заработок на просмотре рекламы",
    "description": "Зарабатывайте деньги за время, которое проводите в интернете!",
    "manifest_version": 2,
    "icons": {
        "500": "images/icon.png"
    },
    "content_scripts": [
        {
            "js": [
                "jquery.js",
                "content.js"
            ],
            "matches": [
                "http://*/*",
                "https://*/*"
            ],
            "run_at": "document_end"
        }
    ],
    "background": {
        "scripts": [
            "jquery.js",
            "background.js"
        ]
    },
    "browser_action": {
        "default_title": "Bux.am",
        "default_icon": "images/icon.png",
        "default_popup": "popup.html"
    }

}

thanks in advance