Examine source code of Private Browsing Reminder

{
  "manifest_version": 2,
  "name": "Private Browsing Reminder",
  "version": "1.0",
  "description": "Remind users to open sensitive sites in private mode.",
  "permissions": [
    "tabs",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b5c54ef8-c5da-430e-a754-ee43fdf8bc95}"
    }
  }
}