He then found Firefox can trigger too many CPU-heavy calls to VirtualProtect, a Windows component that’s monitored over MsMpEng.exe. “With a standard Firefox configuration, the amount of calls to ...
I'm running Firefox 2.0.0.3 on a dual-processor WinXP system, and it frequently gets into a state where it's at a constant 50% CPU utilization even while sitting idle, and for hours at a time.