text: Curious problem!?\n\nI could not simulate the problem, but then I do not use Matrox card.\n\nAll windows programs use standard X-Y pointers for the top left hard corner of a window. They should be x=0 and y=0 when the screen  is maximized. That is a function of the operating system not Firefox or the video card. I cant imagine something screwing with these settings.\n\nI would see if the problem occurs when using 1024 x 768 screen size mode.\n\nYou may want to make sure you have all the Windows updates.  I would see if Microsoft has a fix for it.