The Cheezburger network site, Memebase.com uses up a significant amount of resources in mere seconds. Its so intense that about:memory has problems recording it in a timely manner.
https://perfht.ml/2ixrHn7 Hopefully this Gecko Profile will help. STR: Just browse the pages and scroll.
Can you test out in safe mode and provide us a list of extensions you use from about:support?
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