[fulafel]

If your browser is running in a wasm sandbox, it's a minor comfort that only your browser gets compromised which contains all your creds, etc.

[flohofwoe]

Only parts of the browser are running in multiple small isolated WASM sandboxes, those WASM sandboxes are isolated from outside world about as well as if they would run in their own process.

[fulafel]

Compartments of internally unsafe sandboxes are what we have now, with browsers employing native-code sandboxes and isolated renderer processes etc. It gets leaky.