> It would be interesting to have a browser tool that is like strace and you could filter by calls, so you can see exactly where window.navigator is being used for example, or localStorage.setItem.
Because JavaScript is dynamic, you can often rebind things like window.fetch to trace what’s going on (store the old copy and replace with a new one that does something before delegating). If you can arrange your shim to be loaded before any other JS, I guess you could implement something like object capabilities for JavaScript?
