Examine source code of Boxel 3D

{
  "manifest_version": 3,
  "name": "Boxel 3D",
  "description": "Boxel 3D is a speedrunning game packed with challenging levels, custom skins, online multiplayer, and a creative level editor.",
  "version": "2.9.1",
  "action": {
    "default_popup": "index.html",
    "default_title": "Boxel 3D",
    "default_icon": {
      "16": "png/icon16.png",
      "48": "png/icon48.png"
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self' 'wasm-unsafe-eval';"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e10b20a6-4aa8-41c4-b897-1a2a7810924a}"
    }
  },
  "permissions": [
    "storage",
    "unlimitedStorage"
  ]
}