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Looks like the user, Hazel, is not using LinkedIn, which for me is the number one culprit when it comes to CPU and memory usage.

If my fan starts running fast, every time it is due to one or more LinkedIn tab running at 100% CPU, on Mac.

There may be other sites that are worse and I’m just not using them.

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Firefox has a decent task manager view that I use to identify rogue tabs like that. Shift+Esc -> sort tabs by CPU usage (it lives at the URL about:processes and can be found under 'More tools' -> 'Task manager' too). I imagine that's how you discovered it was LinkedIn? Though if you're not a tab hoarder it might be fairly easy to discover just by trial and error...

I kill LinkedIn tabs via task manager all the time. Yes, that is how I had figured out that it’s the culprit in almost 100% of the cases. In fact just killing the tab and refreshing/reloading it helps, when I need that tab.

Exactly right, I also noticed LinkedIn eats resources this way. Gotta wonder why that is.

I can't think of a single reason to maintain a linkedin tab open.

Testing browser performance

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