Examine source code of VACLive-Checker

{
  "manifest_version": 3,
  "name": "VACLive-Checker",
  "version": "1.0.0",
  "description": "Prüft die Freundesliste eines Steam-Profils auf VACLive-Banns (Daten: cstracker.gg via csst.at).",
  "permissions": [
    "declarativeNetRequest"
  ],
  "host_permissions": [
    "https://steamcommunity.com/*",
    "https://csst.at/*"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "VACLive-Checker öffnen"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "csst_referer",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "vaclive-checker@marcel.local",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}