Examine source code of Sticky Notes it

{
  "manifest_version": 2,
  "name": "Sticky Notes",
  "version": "1.0",
  "description": "Tạo ghi chú cho từng trang web",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a660d83c-8916-4845-9829-e46852c365e0}"
    }
  }
}