Since I upgraded to FF4.0 it acts like it was running another program in the background. it will lock up and turn the page view to a white overlay and will not react to a mouse command anywhere, not even let you out of that page. it does it with any thing you try to open but not all the time. yesterday my AVG anti virus put up a dialog box that said FF was using to much memory (1 GB). How do I correct it? I am sick of having to reboot to try and use it. I was very happy with the old Firefox . THi version Stinks. Thanks RAY Menzel