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From an accessibility point of view there are many people who find it easier to control their computers by (effectively) the keyboard, rather than the mouse. One of the things that comes up semi-regularly is mistakes caused by not realising which window is the active one.

I'm looking for a tweak or even a problem that makes it easier to see which window is the active one in OSX. I'd like like something that just, for example, dramatically increased the shadow, or boardered the active window in Red.

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You could try white on black - then the shadow becomes more of a glow. Ctrl-Alt-Cmd-8 or Apple -> System Preferences -> Universal Access -> Seeing -> White on Black.

In other hand you can use third-party program like HaseOver

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