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I suggest looking at widget/src/*/nsWindow.cpp for starters. It seems like the OS-Specific mouse stuff is all done in there.
Try researching in different OS APIs about setting the mouse cursor position directly, it should turn up some interesting results.
==WIN32 API==
Here's some code that actually locks the mouse into a rectangle with no width or height in the center of the screen in WIN32.
* http://pastebin.com/gNmh1uhz
* or [http://pastebin.com/3YBfXxM2 http://pastebin.com/3YBfXxM2](requires adding the mMousePos and mMouseLock member variables)
