Examine source code of WebAssistant3

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "WebAssistant3",
  "version": "3.1resigned1",
  "manifest_version": 2,
  "description": "Модуль для работы с электронной подписью на веб-порталах",
  "icons": {
    "128": "icon-128.png"
  },
  "applications": {
    "gecko": {
      "id": "WebAssistant@rustelecom.ru",
      "strict_min_version": "50.0"
    }
  },
  "background": {
    "scripts": [
      "background.js",
      "FireBreathPromise.js",
      "wyrmhole.js",
      "firewyrm.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    "FireBreathPromise.js",
    "firewyrm.js",
    "wyrmhole.js",
    "wyrmhole-page.js"
  ],
  "permissions": [
    "nativeMessaging"
  ]
}