Two updates ago my system now uses 100% of my CPU and memory on occasion. Norton tells me that a website is slowing down my system. When I go to task manager Firefox is open 5 times and is driving my system to the limit so I have to end the task. I also have clicked to read an article and my system halts, all I see is the reload and an X flashing in the left hand top and I have to end the task and it also has my computer maxed out and Firefox is open 5 times as well with CPU and memory at 100%. I also don't have any other app open.