Examine source code of vk-disk-extension

{
  "manifest_version": 2,
  "name": "VK Disk Extension",
  "version": "2018.5.3resigned1",
  "description": "Our Extention for VK Disk",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "tabs",
    "storage",
    "cookies",
    "*://vkdisk.faki-mipt.ru/*",
    "*://sp4.park.bmstu.cloud/*"
  ],
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{22a82224-63a2-4eea-902b-dc2e4559731c}"
    }
  }
}