Examine source code of Sites Reviews Widget

{
  "manifest_version": 2,
  "name": "Виджет Отзывов Sites.Reviews",
  "version": "1.0",
  "description": "Показывает отзывы о сайте с Sites.Reviews",
  "homepage_url": "http://sites.reviews",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    },
    "default_popup": "popup.html",
    "default_title": "Открыть отзывы с Sites.Reviews"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "gusevlive@vk.com",
      "strict_min_version": "57.0"
    }
  }
}