Thanks, I will do so.

When Firefox optimised for multi-process, did they test for single-core? I'm on a machine released this decade - a rare instance of a single core x86_64 machine (fanless Atom NUC)

Facebook is pretty much now unusable with they do their asynchronous page loading of stories.

I haven't actually checked if firefox was eating my CPU but with my pre-quantum profile on post-quantum Firefox (connected to firefox Sync) Firefox would essentially lock up whenever I was on a page with a lot of Canvas stuff. I made a fresh profile and the issue was gone. Don't know if this is at all related to what you're collecting.