Examine source code of UBExtension

{
  "manifest_version": 2,
  "name": "UBExtension",
  "short_name": "UBExtension",
  "version": "1.0.1",
  "minimum_chrome_version": "23",
  "description": "Extension for imposing an electronic-digital signature in accordance with the national standard of Ukraine DSTU 4145-2002",
  "icons": {
    "16": "UBLogo16.png",
    "48": "UBLogo48.png",
    "128": "UBLogo128.png"
  },
  "applications": {
    "gecko": {
      "id": "ubextension@inbase.com.ua",
      "strict_min_version": "72.0"
    }
  },
  "background": {
    "scripts": [
      "main.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "ctUbExtension.js"
      ]
    }
  ],
  "offline_enabled": true,
  "permissions": [
    "nativeMessaging"
  ]
}