Thay đổi màu chữ H2

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "manifest_version": 3,
    "name": "Thay \u0111\u1ed5i m\u00e0u ch\u1eef H2",
    "version": "1.0",
    "description": "Thay \u0111\u1ed5i m\u00e0u ch\u1eef c\u1ee7a c\u00e1c th\u1ebb H2 khi v\u00e0o b\u1ea5t k\u00ec website n\u00e0o, nh\u1eb1m m\u1ee5c \u0111\u00edch nh\u1eadn di\u1ec7n",
    "homepage_url": "https:\/\/thanhtin.net\/",
    "permissions": [
        "scripting",
        "activeTab"
    ],
    "action": {
        "default_icon": "icon.png",
        "default_title": "Thay \u0111\u1ed5i m\u00e0u ch\u1eef H2 sang m\u00e0u \u0111\u1ecf th\u00e2n y\u00eau"
    },
    "background": {
        "service_worker": "background.js"
    }
}