Examine source code of Bedtime Reminder

{
  "manifest_version": 2,
  "name": "Bedtime Reminder",
  "version": "1.0",
  "description": "Reminds kids it's time to sleep when using the browser too late.",
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{efbd65b3-87c4-49a5-b4aa-a55eb12599bc}"
    }
  }
}