Examine source code of Momo reader

{
  "manifest_version": 2,
  "name": "Momo reader",
  "version": "1.2resigned1",
  "icons": {
    "48": "icon.png"
  },
  "applications": {
    "gecko": {
      "id": "momomorwer@gmail.com",
      "strict_min_version": "45.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://vk.com/*"
      ],
      "js": [
        "jquery-3.3.1.min.js",
        "main.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "The Title",
    "default_popup": "test.html"
  }
}