Examine source code of ScreenTime

{
  "name": "ScreenTime",
  "description": "Track your browsing time across websites. Requires tab access to monitor website usage for time tracking only - no data is modified or sent anywhere.",
  "version": "1.0.11",
  "manifest_version": 3,
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_title": "ScreenTime",
    "default_popup": "index.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "unlimitedStorage",
    "idle"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "screentime@example.com",
      "strict_min_version": "109.0"
    }
  }
}