Examine source code of WioKey Companion

{
  "manifest_version": 2,
  "name": "WioKey Authenticator Companion",
  "version": "0.9.11",
  "description": "Online companion bridge for WioKey FIDO2 strong authenticator",
  "minimum_chrome_version": "40.0.0.0",
  "icons": {
    "16": "assets/icons/wiokey_icon.png",
    "48": "assets/icons/wiokey_icon.png",
    "128": "assets/icons/wiokey_icon.png"
  },
  "browser_action": {
    "default_icon": "assets/icons/wiokey_icon.png",
    "default_popup": "index.html",
    "default_title": "WioKey Authenticator Companion"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "run_at": "document_start",
      "matches": [
        "https://*/*"
      ],
      "js": [
        "content/index_firefox.js"
      ]
    },
    {
      "all_frames": true,
      "run_at": "document_end",
      "matches": [
        "https://*/*"
      ],
      "js": [
        "content/index_swal2.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background/index.js"
    ],
    "persistent": true
  },
  "web_accessible_resources": [
    "assets/icons/*.png"
  ],
  "permissions": [
    "https://*/*",
    "tabs",
    "webNavigation"
  ],
  "content_security_policy": "script-src 'self' https://www.gstatic.com/ https://*.firebaseio.com https://www.googleapis.com https://www.googletagmanager.com https://stackpath.bootstrapcdn.com; object-src 'self'"
}