Examine source code of VK Expert

{
  "content_security_policy": "script-src 'self' https://*.vk.com https://vk.com https://vk.expert; object-src 'self'",
  "incognito": "spanning",
  "name": "VK Expert",
  "version": "1.0.13",
  "manifest_version": 2,
  "description": "Добавляет множество функций в соц. сеть vk.com",
  "browser_action": {
    "default_icon": "icons/default.png",
    "default_title": "VK Expert",
    "default_popup": "pages/popup/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "iandretill@gmail.com",
      "strict_min_version": "91.1.0"
    }
  },
  "icons": {
    "16": "icons/default.png",
    "48": "icons/default.png",
    "128": "icons/default.png"
  },
  "background": {
    "scripts": [
      "source/lib/jquery.js",
      "source/setting.js",
      "source/plugins.js",
      "source/core.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://vk.com/*",
        "*://*.vk.com/*"
      ],
      "js": [
        "source/setting.js",
        "source/content.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://vk.expert/*"
      ],
      "js": [
        "source/content_vkh.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage",
    "cookies",
    "downloads",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "proxy",
    "clipboardWrite",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "source/lib/fontawesome/brands.js",
    "source/lib/fontawesome/fontawesome.js",
    "source/lib/fontawesome/regular.js",
    "source/lib/fontawesome/solid.js",
    "source/lib/jquery.js",
    "source/setting.js",
    "source/plugins.js",
    "source/vk.js"
  ]
}