It's something I'm accustomed to when using PCs when I was in college. The default window manager was FVWM and it had a "where you type is what window the mouse is in" policy, aka "focus follows mouse." I find that it helps track where it is. Besides, web pages are so bloated I can hide the mouse cursor in all that fat. ;)
Windows doesn't do that, alas... well, not easily.
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