Examine source code of Drink Water

{
  "manifest_version": 2,
  "name": "Drink Water",
  "version": "0.3resigned1",
  "description": "Reminds you to drink water from time to time.",
  "icons": {
    "480": "glass.png"
  },
  "applications": {
    "gecko": {
      "id": "drink-water@neocities"
    }
  },
  "background": {
    "scripts": [
      "background-script.js"
    ]
  },
  "permissions": [
    "notifications",
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "glass.png",
    "default_title": "Drink Water",
    "default_popup": "popup/index.html"
  },
  "web_accessible_resources": [
    "water.wav",
    "waterQuotes.json",
    "bottle.png",
    "glass.png"
  ]
}