Yes. I think most people misunderstand how this works.

A bit of JS code is injected that takes the nostr.* calls communicates with the extension that is in an isolated context (AFAIK with postMessage). The extension then checks permissions or does popups.

:/ please do some research 

 yeah its slightly more isolated, but its still floating around in the process space and js env. I would just feel more comfortable with runtime.sendNativeMessage to an app with no network access and shared keychain access with Damus 

 makes sense, but you probably have bigger problems if there’s a safari ACE vulnerability