It would be nice to have a latency profiler that would dump stack traces (or break) when execution takes more than 0.1 seconds (or 0.01...) for both js and nati

It would be nice to have a latency profiler that would dump stack traces (or break) when execution takes more than 0.1 seconds (or 0.01...) for both js and native/html and xul. Also, realiable support for "break on throw exception".