manifest.json

{
    "manifest_version": 2,

    "name": "Youtube shortcuts",
    "description": "This extension helps you to control a Youtube video using shortcuts.",
    "version": "1.0",
    "background": {
        "scripts": ["popup.js"],
        "persistent": true
    },

    "commands": {
        "prev-track": {
            "suggested_key": {
                "default": "Ctrl+Shift+7",
                "mac": "Command+Shift+7"
            },
            "description": "Previous Track",
            "global": true
        },
        "play-pause-track": {
            "suggested_key": {
                "default": "Ctrl+Shift+8",
                "mac": "Command+Shift+8"
            },
            "description": "Play/Pause-Repeat Track",
            "global": true
        },
        "next-track": {
            "suggested_key": {
                "default": "Ctrl+Shift+9",
                "mac": "Command+Shift+9"
            },
            "description": "Next Track",
            "global": true
        },
        "skip-ads": {
            "suggested_key": {
                "default": "Ctrl+Shift+6",
                "mac": "Command+Shift+6"
            },
            "description": "Skip Ads",
            "global": true
        }
    },

    "icons": { "16": "icon16.png",
               "48": "icon48.png",
              "128": "icon128.png" },

    "browser_action": {
        "default_popup": "popup.html"
    },
    "permissions": [
        "activeTab",
        "tabs",
        "*://www.youtube.com/*",
        "notifications"
    ],
    "web_accessible_resources": [
        "icon48.png"
    ]
}