Can you see which browser window is using CPU time?

With either IE or firefox, a runaway script can eat 100% cpu time on that CPU core. But I often have 15+ browser windows up at a time. I want to identify which browser window is out of control so I can close it, but going to the task manager only identifies that the program (IE or firefox) is using the CPU, not which window.

Is there any way to figure it out?

You could kill the heaviest browser process and see which window closes…

Or do you need to know before you kill it?

The browser processes aren’t broken down by windows though. You can kill IE or firefox entirely, but not their individual windows.

No, task manager can’t tell you, because task manager doesn’t have the information available to it.

I believe that Google Chrome has a process for every tab, which means that the task manager can tell which Chrome tab is out of control.

I often have the same problem. While this isn’t an answer to your question, you may find the Firefox add-on “Session Manager” to be helpful, since it lets you save all the tabs and windows you have open and re-open them as desired.

Chrome has a maximum number of processes. I forget the number.

You might try this free utility as it is far more detailed than task manager :