Examine source code of LabelButler

{
  "manifest_version": 3,
  "name": "LabelButler",
  "version": "0.1.0",
  "description": "Browsererweiterung zum bequemen Drucken von Versandetiketten für Cardmarket, eBay, DHL, kombiniert mit Internetmarken.",
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "contextMenus",
    "tabs",
    "clipboardWrite",
    "downloads"
  ],
  "host_permissions": [
    "https://*.ebay.com/*",
    "https://*.ebay.de/*",
    "https://*.ebay.co.uk/*",
    "https://*.ebay.fr/*",
    "https://*.ebay.it/*",
    "https://*.ebay.es/*",
    "https://*.ebay.at/*",
    "https://*.ebay.ch/*",
    "https://*.ebay.nl/*",
    "https://*.ebay.be/*",
    "https://*.ebay.pl/*",
    "https://*.ebay.ie/*",
    "https://*.ebay.com.au/*",
    "https://*.ebay.ca/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.cardmarket.com/*"
      ],
      "js": [
        "dist/CardmarketContent.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://*.ebay.com/*",
        "https://*.ebay.de/*",
        "https://*.ebay.co.uk/*",
        "https://*.ebay.fr/*",
        "https://*.ebay.it/*",
        "https://*.ebay.es/*",
        "https://*.ebay.at/*",
        "https://*.ebay.ch/*",
        "https://*.ebay.nl/*",
        "https://*.ebay.be/*",
        "https://*.ebay.pl/*",
        "https://*.ebay.ie/*",
        "https://*.ebay.com.au/*",
        "https://*.ebay.ca/*"
      ],
      "js": [
        "dist/EbayHooks.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://*.ebay.com/*",
        "https://*.ebay.de/*",
        "https://*.ebay.co.uk/*",
        "https://*.ebay.fr/*",
        "https://*.ebay.it/*",
        "https://*.ebay.es/*",
        "https://*.ebay.at/*",
        "https://*.ebay.ch/*",
        "https://*.ebay.nl/*",
        "https://*.ebay.be/*",
        "https://*.ebay.pl/*",
        "https://*.ebay.ie/*",
        "https://*.ebay.com.au/*",
        "https://*.ebay.ca/*"
      ],
      "js": [
        "dist/EbayHooksMainWorld.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    }
  ],
  "background": {
    "scripts": [
      "dist/background.js"
    ]
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_title": "LabelButler",
    "default_icon": {
      "16": "icons/toolbar-icon-16.png",
      "32": "icons/toolbar-icon-32.png"
    }
  },
  "web_accessible_resources": [],
  "options_ui": {
    "page": "dist/pages/settings/settings.html",
    "open_in_tab": true
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "labelbutler@labelbutler.com",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "128.0"
    }
  }
}