Examine source code of Eye Break Reminder

{
  "manifest_version": 2,
  "name": "Eye Break Reminder",
  "version": "1.0",
  "description": "Reminds you to take regular eye breaks while browsing.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "notifications"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4b7f719d-dc8c-4ae5-9d12-33ed8f9e0800}"
    }
  }
}