Examine source code of Hydration Reminders

{
  "manifest_version": 2,
  "name": "Hydration Reminder",
  "version": "1.0",
  "description": "Set reminders to stay hydrated throughout the day.",
  "permissions": [
    "notifications",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Hydration Reminder"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c51e8dc9-7126-45a6-9c7b-ac9c61af6045}"
    }
  }
}