Examine source code of SeeOnce Privacy

{
  "name": "SeeOnce Privacy",
  "short_name": "SeeOnce",
  "description": "High strength end-to-end encryption with perfect forward secrecy for your favorite email, plus real-time secure chat",
  "version": "1.2.13",
  "manifest_version": 3,
  "icons": {
    "16": "seeonce-icon16.png",
    "48": "seeonce-icon48.png",
    "128": "seeonce-icon128.png"
  },
  "content_security_policy": {
    "extension_pages": "default-src 'self'; img-src 'self' data:; style-src 'self'"
  },
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": {
      "16": "seeonce-icon16gray.png",
      "48": "seeonce-icon48gray.png"
    },
    "default_title": "SeeOnce Privacy"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "seeonce@passlok.com"
    }
  }
}