Yes, I did notice the fans working harder particularly the cooler for the CPU.As a Firefox user, have you noticed any slowdowns or your fan(s) having to work a bit harder? It works fine on both mine and the woman's Windows desktops. They're a lot more powerful than this laptop but Id have thought with how well optimised browsers are these days and how light Linux is, it wouldn't cause any issues.
I hear good things about Pale Moon but I know very little of Vivaldi, I'll keep these in mind.
I've not used Tor in many years now, didn't even think of that as an option for browsing the every day web.
So I stopped using the Cinnamon desktop on my Devuan install and installed the Mate desktop.
Since switching to the Mate desktop the fan for the CPU doesn't work as hard.
Let us know how things go.