Examine source code of Whisper Decrypt

{
  "manifest_version": 3,
  "name": "Whisper Decrypt",
  "version": "0.1.0",
  "description": "Decrypt whisper.beer notes locally in the popup. Decrypt code ships inside this signed package, not fetched from any server.",
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/16.png",
      "32": "icons/32.png",
      "48": "icons/48.png",
      "128": "icons/128.png"
    }
  },
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "96": "icons/96.png",
    "128": "icons/128.png"
  },
  "host_permissions": [
    "https://api.whisper.beer/*"
  ],
  "optional_host_permissions": [
    "*://*/*"
  ],
  "content_security_policy": {
    "extension_pages": "default-src 'self'; style-src 'self'; script-src 'self'; connect-src *"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "whisper-decrypt@whisper-backend.example",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}