Examine source code of Browser Cleanup Reminder

{
  "manifest_version": 2,
  "name": "Browser Cleanup Reminder",
  "version": "1.0",
  "description": "A reminder to clean up your browser data (cookies, cache) on a weekly or monthly basis.",
  "permissions": [
    "notifications",
    "browsingData"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7ba8bba4-5e3d-4a85-97ba-e6e20229820e}"
    }
  }
}