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Spinning the mouse wheel ought to scroll the window under the mouse pointer, not the window with focus. Ideally the scrolled window does not receive focus as a result, but that would be better than nothing. Scroll-focus-follows-mouse is commonplace in modern GUI's, including all browsers I know of.
See also bug 20647 *** This bug has been marked as a duplicate of 45355 ***
*** Bug 50895 has been marked as a duplicate of this bug. ***