Examine source code of VK ALARM

{
  "manifest_version": 2,
  "name": "VK ALARM",
  "description": "This extension helps to notify several users of VK.com from the conversation in which you are a member.",
  "author": "Ivan Shpartko",
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "52.0",
      "id": "{3da1b6a0-d1ef-40f0-8777-b3cf0e654179}"
    }
  },
  "version": "1.112resigned1",
  "icons": {
    "128": "/icons/icon128x128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://vk.com/*"
      ],
      "js": [
        "./dist/bundle.js"
      ]
    }
  ]
}