"It took over 5 years, but Microsoft has finally fixed a bug that caused Windows Defender to drain CPU resources when Mozilla’s Firefox browser is active.

In 2018, Mozilla staff reported that #Windows 10’s built-in malware-detection program caused CPU consumption to top 30%. "

5-Year-Old #WindowsDefender Bug That Caused #CPUSpikes on #Firefox Finally Fixed | #BugHunt #Browsers | PCMag

https://www.pcmag.com/news/5-year-old-windows-defender-bug-cpu-spikes-on-firefox-finally-fixed