Examine source code of Drink Some Water

{
  "description": "A reminder to drink some water every two hours.",
  "homepage_url": "https://github.com/nabendu82/Addons",
  "icons": {
    "256": "icons/icon.png"
  },
  "version": "2.0",
  "manifest_version": 2,
  "name": "Drink Some Water",
  "permissions": [
    "alarms",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "strict_min_version": "55.0a2"
    }
  }
}