Comment 4 for bug 103306

Also, WITH COMPIZ ON if you maximize Firefox (or any other program that makes the scrollbar the screen's edge when maximized), then Fitt's law doesn't work anymore either. If you throw your mouse to the right edge or left edge (if you switch writing direction for diff. languages) of the screen then the scrollbar isn't selected; however, it should be.

It's kind of like how the start button pre-Windows XP never got hit if you threw your mouse to the bottom left corner; very annoying ;)