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This page is for tracking different parts of the Firefox code that relate to the mouse in different ways.
I suggest looking at widget/src/*/nsWindow.cpp for starters. It seems like the OS-Specific mouse stuff is all done in there.
==WIN32 API==
* [http://mxr.mozilla.org/mozilla-central/source/widget/src/windows/nsWindow.cpp#3874 Internal mouse event tracking]
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.
RECT windowRect;
::GetWindowRect(mWnd, &windowRect);
nsIntPoint mousePos;
mousePos.x = windowRect.right/2;
mousePos.y = windowRect.bottom/2;
RECT mouseRect = { mousePos.x, mousePos.y, mousePos.x, mousePos.y };
ClipCursor(&mouseRect); // Forces the mouse to be only within that rectangle on the screen, giving it no width and height means it's locked.