Examine source code of AvtoStat.by

{
  "name": "AvtoStat.by",
  "version": "2.0.3resigned1",
  "manifest_version": 2,
  "author": "AnnetLab",
  "description": "Статистика по автомобильным объявлениям Беларуси",
  "homepage_url": "https://avtostat.by/",
  "icons": {
    "32": "icons/logo_32x32.png",
    "64": "icons/logo_64x64.png",
    "128": "icons/logo_128x128.png"
  },
  "browser_action": {
    "default_icon": {
      "32": "icons/logo_32x32.png"
    }
  },
  "options_page": "options.html",
  "content_scripts": [
    {
      "matches": [
        "https://ab.onliner.by/*",
        "https://cars.av.by/*"
      ],
      "js": [
        "app.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "permissions": [
    "storage",
    "https://ab.onliner.by/",
    "https://cars.av.by/",
    "https://avtostat.by/"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "applications": {
    "gecko": {
      "id": "hello@avtostat.by"
    }
  }
}