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by feelandcoffee 2557 days ago
Do you run mac OS? Because I had this same issue with a macbook, when jump to Windows and Linux, the CPU keep the same as Chrome, but in mac Firefox was slow, and make the fans be at top speed.
1 comments

Yup. Macbook Air 6.1, Mojave. 8 gigs ram. Plenty (30+gigs) free SSD disk space.
Sounds like https://bugzilla.mozilla.org/show_bug.cgi?id=1404042 . The bug is old and has a huge number of comments; maybe just start with comment 199.