Examine source code of Break Reminder on Scroll

{
  "manifest_version": 2,
  "name": "Break Reminder on Scroll",
  "version": "1.0",
  "description": "Nhắc nghỉ mắt 20 giây nếu bạn cuộn liên tục hơn 5 phút.",
  "permissions": [
    "notifications",
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8fa888aa-957c-4c53-b015-7f560d2c9abb}"
    }
  }
}