In Firefox, clicking any window brings all Firefox windows to front.
In Safari, clicking on the address bar doesn't bring the window to the foreground, and clicking on one window, other windows stay in background. (I use this to add data to Delicious Library)
I think in earlier versions of the Mac OS (OS 9, for instance), this wasn't even an option. I much prefer the Safari version, but I could see how some folks would get confused about it all.
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