Examine source code of MyCena Fortress Extension

{
  "manifest_version": 2,
  "name": "MyCena Fortress Extension",
  "short_name": "MyCena Fortress Extension",
  "description": "MyCena web extension allows you to copy and paste passwords from your mobile to the desktop.",
  "author": "Lookiimobile",
  "version": "2.0.3",
  "applications": {
    "gecko": {
      "id": "largatseif@outlook.com"
    }
  },
  "content_security_policy": "script-src 'self';object-src 'self'",
  "browser_action": {
    "default_title": "MyCena Fortress Extension",
    "default_popup": "index.html",
    "default_icon": {
      "16": "assets/logo/mycena_16x16.png",
      "32": "assets/logo/mycena_32x32.png",
      "48": "assets/logo/mycena_48x48.png",
      "128": "assets/logo/mycena_128x128.png"
    }
  },
  "permissions": [
    "https://extapi.mycena.co/",
    "https://cdnjs.cloudflare.com/",
    "https://www.gstatic.com/",
    "https://*.firebaseio.com/",
    "storage",
    "clipboardWrite"
  ],
  "icons": {
    "16": "assets/logo/mycena_16x16.png",
    "32": "assets/logo/mycena_32x32.png",
    "48": "assets/logo/mycena_48x48.png",
    "128": "assets/logo/mycena_128x128.png"
  }
}