How to get CPU usage from Firefox when you run sitespeed.io tests?

Your question

Hi folks.

I think I asked this in slack aaaaages ago, but I realise it's probably better to ask in a public forum instead.

Is it technically possible to run sitespeed using Firefox, and as part of a test run, generate an output file for the scripted actions taken, that can be consumed by the firefox profiler tool listed below, maaaaaybe a bit a bit like how you can use Sitespeed to create Harfiles for later analysis??

If so, in high level terms how would you do it?

I'm asking in the context of wanting to automate test runs using the Firefox Profiler, but it's beyond my knowledge of both Sitespeed and of Firefox Profiler.

This talk about the power profiling tool for Firefox is quite a good intro
https://fosdem.org/2023/schedule/event/energy_power_profiling_firefox/

As is the deck:
https://fosdem.org/2023/schedule/event/energy_power_profiling_firefox/attachments/slides/5537/export/events/attachments/energy_power_profiling_firefox/slides/5537/FOSDEM_2023_Power_profiling_with_the_Firefox_Profiler.pdf