Examine source code of Ave Blacklist

{
  "name": "Ave Blacklist",
  "description": "Расширение для блокировки пользователей и объявлений на Авито (Avito)",
  "version": "1.0.11",
  "manifest_version": 3,
  "permissions": [
    "storage",
    "downloads"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.avito.ru/*"
      ],
      "js": [
        "contentScript.js"
      ],
      "css": [
        "userCSS.css"
      ],
      "run_at": "document_start"
    }
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "Ave Blacklist",
    "default_icon": "images/icon32.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ave.blacklist@syrnikovpavel.ru",
      "strict_min_version": "109.0"
    }
  }
}