Examine source code of VK Mentions

{
  "manifest_version": 2,
  "name": "VK Mentions",
  "version": "1.3",
  "description": "Позволяет посмотреть упоминания пользователя.",
  "content_scripts": [
    {
      "matches": [
        "*://vk.com/*"
      ],
      "js": [
        "mentions.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{956f7c87-4329-4e66-a2b4-2c169ff3cf3d}"
    }
  }
}