Examine source code of Break & Hydrate Reminder

{
  "manifest_version": 2,
  "name": "Break Reminder",
  "version": "1.0",
  "description": "Reminds you each hour to take a break and hydrate!",
  "permissions": [
    "notifications",
    "alarms"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2380b979-bf40-431d-9fbc-d2704c5e9acd}"
    }
  }
}