I was using Firefox50, and noted that where I never hear the fans going in my desktop computer, that the fan(s) were running at max speed. Sorry, I do not have actuals today, but will post some actuals from lm-sensors etc, later.
I multi-boot, between Fedora 24/25 and SUSE Leap42.1 and in rebooting to Fedora, within a few minutes, the fan speed returned to normal – coasting.
Am I alone with this subjective information? If you multi-boot, can you collaborate or deny same?