Examine source code of Tab Focus Reminder

{
  "manifest_version": 2,
  "name": "Tab Focus Reminder",
  "version": "1.0",
  "description": "Nhắc bạn nhớ lý do mở tab mới.",
  "permissions": [
    "storage",
    "tabs",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "browser_action": {
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4b4cc043-a3b7-4a40-b192-9bd2ffe4c5ee}"
    }
  }
}