Issue noticed since upgrading to Firefox 4.0. I'll be online for half hour things are fine then all of a sudden Firefox and my mouse freeze for about 5-6 seconds, then okay for 5-6 seconds then freeze up again for 5-6 seconds. That's why I call it click freeze click freeze. I checked other suggestions but nothing has helped. After getting frustrated I'll go to shut down the computer and get stuck again on blue page where it says "please wait while windows is shutting down". At this point I have to turn off the power box to shut down system. Frustrating!!!