Examine source code of Focus Bubble Reminder

{
  "manifest_version": 2,
  "name": "Focus Bubble Reminder",
  "version": "1.0",
  "description": "Hiển thị bong bóng nhắc khi duyệt trang ngoài danh sách công việc.",
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_title": "Focus Bubble Reminder"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f4b8ecbb-4557-4294-94b7-052366f3afa6}"
    }
  }
}