Examine source code of Remember to use water

{
  "manifest_version": 2,
  "name": "Drink Water Reminder",
  "version": "1.0",
  "description": "Nhắc nhở uống nước dựa trên thói quen lướt web.",
  "permissions": [
    "tabs",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{dc8d5c07-cafb-46bc-a4b5-8b7d0f8163a3}"
    }
  }
}