Examine source code of Eye Break Reminder12

{
  "manifest_version": 2,
  "name": "Eye Break Reminder",
  "version": "1.0",
  "description": "Làm mờ tab mỗi 30 phút trong 60 giây để nhắc nghỉ mắt.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{83b48bdd-6269-4e84-8707-57accb8c714e}"
    }
  }
}