Javascript Profiling With Firebug

I realized something today when trying to figure out how to profile my Javascript game jarm. If you go into Firebug and go to the Console tab, there is a button there that says "Profile". For some reason I've never actually noticed it was there! It works just like a regular profiler, click "Profile" and let it do its thing. When you're done click "Profile" again to stop and it will give you a report.