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Try Beta/Nightly! Firefox got much better for MacOS in 70/71 but that version is not yet in stable.
This is macOS specific & apparently actively being investigated, not present here on Linux.
I'm a Linux user. While browsing with Chrome my CPU temperature hovers around 45 degrees. If I start using Firefox it increases to 55 degrees.
Sadly it’s been 5 years. I’ve reported it many times with lots of logs.
There have apparently been considerable improvements in this area in the latest Nightly/Developer editions, not in stable yet.
I have tried once a year. This is always the promise. It’s still not been fixed.

I get downvoted every time by people who don’t want to hear negativity about Firefox - I keep trying because I want it to be usable for me.