vk-messages-tooltip/manifest.json

{
  "name": "VK Messages Tooltip",
  "version": "1.2.1",
  "manifest_version": 3,
  "content_scripts": [
    {
      "js": [
        "script.js"
      ],
      "matches": [
        "https://vk.com/*"
      ]
    }
  ]
}