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Hi! I'm collecting profiles on cases like yours. Here are instructions if you'd like to help: https://www.reddit.com/r/firefox/comments/7knnn4/firefox_quantum_

• deft 9y ago
  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.
• petecox 9y ago
  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.