Examine source code of Pinned Tab Sync

{
  "manifest_version": 2,
  "name": "Pinned Tab Sync",
  "version": "1.0.1",
  "description": "Synchronisiert angepinnte Tabs über mehrere Geräte und Fenster hinweg.",
  "permissions": [
    "tabs",
    "storage",
    "alarms",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "icons": {
    "48": "icon-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "pinnedtabsync@joofthan.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}