Examine source code of Kinopoisk Watch Button

{
  "manifest_version": 2,
  "name": "Kinopoisk Watch Button",
  "description": "Добавляет кнопку 'Смотреть' для перенаправления на SSPoisk.",
  "version": "1.0",
  "icons": {
    "48": "icon-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.kinopoisk.ru/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icon-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "kpwb@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}