If I stop moving my cursor, firefox stops processing. There is a new icon beside the tab title, that is a circle with a dot that travels around the circle and then circle turns green and rotates. Both these will stop moving IF I have stopped moving my cursor/mouse. I dont' have this problem in explorer but I prefer firefox. This just started the second day after I upgraded to newest version. This happens on every page, even logging into email or facebook, I have to keep the cursor moving in order for firefox to process and progress to the next page.